Sin 150 degrees in fraction

Trigonometry is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical ...

Trigonometry. Find the Exact Value sin (105) sin(105) sin ( 105) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(75) sin ( 75) Split 75 75 into two angles where the values of the six trigonometric functions are known. sin(30+45) sin ( 30 + 45) sec 210 = 1/cos 210 = 1/cos (30 + 180) = 1/(-cos 30) . Since (-cos 30) = (-sqr3)/2, then sec 210 = -2/(sqr3) = -(2.sqr3)/3Crude oil is separated into fractions by a technique called fractional distillation. This technique separates the hydrocarbons into fractions by heating the crude oil to about 400 ...sin(225°) sin ( 225 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. −sin(45) - sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. − √2 2 - 2 2. The result can be shown in multiple forms.a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees. secant. the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/cos (θ) sin. sin (θ) is the ratio of the opposite side of angle θ ... Solution. Calculate the value of sin 150 °: First, determine the sign of sin 150 °. It is clear that 150 ° belongs to the second quadrant. It is known that the values of sines are positive + in the second quadrant. It is also known that, sin ( 180 - x) ° = sin x °. Thus, sin 150 ° = sin 180 - 30 ° = sin 30 ° = 1 2. Jan 2, 2024 · Thus, from solving a problem in three different ways and also by a few example problems, we were able to find the value of sin(150°) which turned out to be 0.5 or 1/2 in fraction form.

Trigonometry. Find the Exact Value sin (630) sin(630) sin ( 630) Remove full rotations of 360 360 ° until the angle is between 0 0 ° and 360 360 °. sin(270) sin ( 270) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. Find the Exact Value sin (135 degrees ) sin(135°) sin ( 135 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(45) sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. √2 2 2 2. The result can be shown in multiple forms. Exact Form: √2 2 2 2. a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees. secant. the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/cos (θ) sin. sin (θ) is the ratio of the opposite side of angle θ ...Evaluate sin(150 degrees )^2-cos(150 degrees )^2. Step 1. ... Move the negative in front of the fraction. Step 3. The result can be shown in multiple forms. Exact Form: Or you can say, the Sine of angle α is equal to the ratio of the opposite side (perpendicular) and hypotenuse of a right-angled triangle. The trigonometry ratios sine, cosine and tangent for an angle α are the primary functions. The value for sin 45 degrees and other trigonometry ratios for all the degrees 0°, 30°, 60°, 90°,180° are ...

What is the value of sin(150) ? The value of sin(150) is 1/2 Study Tools AI Math Solver Popular Problems Worksheets Study Guides Practice Cheat Sheets Calculators Graphing Calculator Geometry CalculatorTo convert from degrees to radians, multiply the number of degrees by π/180. This will give you the measurement in radians. If you have an angle that's 90 degrees, and you want to know what it is in radians, you multiply 90 by π/180. This gives you π/2. Created by Sal Khan and Monterey Institute for Technology and Education. To find the exact values of cos 150° and sin 150°, we will use the trigonometric identity cos (180° - Θ) and sin (180° - Θ). Answer: The exact value of cos (150 ∘) is −√3/2 and sin (150 ∘) is 1/2. Now, let us understand the way in which we can find the value of cos 150° and sin 150°. Explanation: For cos 150°, Explanation: sin(150∘) = sin(180∘ − 30∘) = sin30∘. because sin is positive in the 2nd quadrant, so. sin30∘ = 1 2. Answer link. Find sin 150 You may find sin 150 by …Find the Exact Value sin(75) Step 1. Split into two angles where the values of the six trigonometric functions are known. Step 2. Apply the sum of angles identity ...

Amc theatres stony brook movie times.

Calculate the value of sin 150 °: First, determine the sign of sin 150 °. It is clear that 150 ° belongs to the second quadrant. It is known that the values of sines are positive + in the second quadrant. It is also known that, sin (180-x) ° = sin x °. Thus, sin 150 ° = sin 180-30 ° = sin 30 ° = 1 2. Therefore, the value of sin 150 ...What is the value of sin(150) ? The value of sin(150) is 1/2 Study Tools AI Math Solver Popular Problems Worksheets Study Guides Practice Cheat Sheets Calculators Graphing Calculator Geometry CalculatorCompute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ...In this video, we learn to find the value of sin150. Here I have applied sin(180 - x) = sin(x) identity to find the value of sin(150). The URL of the video e...

Many brokerages will allow you to buy and sell fractional shares in exchange-traded funds, which can be a handy way to invest if you don't have much money available to put into the...As you know, radians are written as a fraction with a π, such as 2π/3, 5π/4, or 3π/2. ... 45°=45pi/180 radians is the stretch of the circle at 45° and sin(45°)=sqr(2)/2 the y-value (or opposite side of triangle) at 45°. ... We're asked to convert 150 degrees and negative 45 degrees to radians. Step 1: Plug the angle value, in degrees, in the formula above: radian measure = (150 × π)/180. Step 2: Rearrange the terms: radian measure = π × 150/180. Step 3: Reduce or simplify the fraction of π if necessary. Calculating the gcd of 150 and 180 [gcd(150,180)], we've found that it equals 30. The value of cot 150 degrees can be calculated by constructing an angle of 150° with the x-axis, and then finding the coordinates of the corresponding point (-0.866, 0.5) on the unit circle. The value of cot 150° is equal to the x-coordinate (-0.866) divided by the y-coordinate (0.5). ∴ cot 150° = -1.7321. Download FREE Study Materials.Sine calculator to easily calculate the sine function of any angle given in degrees or radians. Calculate sin(x) with this trigonometry calculator. Sin angle calculator with degrees and radians. ... 150 ° 5π/6: 0.50: 180° π: 0 ... Fraction. Trigonometry. Area. Volume. Random Number. Password Generator. Age. Days. Time card. BMI. Body Fat ...The sine of theta (sin θ) is the hypotenuse's vertical projection (green line); and; The cosine of theta (cos θ) is the hypotenuse's horizontal projection (blue line). We can rotate the radial line through the four quadrants and obtain the values of the trig functions from 0 to 360 degrees, as in the diagram below:For sin 210 degrees, the angle 210° lies between 180° and 270° (Third Quadrant ). Since sine function is negative in the third quadrant, thus sin 210° value = - (1/2) or -0.5. Since the sine function is a periodic function, we can represent sin 210° as, sin 210 degrees = sin (210° + n × 360°), n ∈ Z. ⇒ sin 210° = sin 570° = sin ...The sin of 15 degrees equals the y-coordinate whereas cos of 5 degrees equals the x-coordinates of the point of intersection of unit circle and r. Whenever we plot an angle, its cosine value lies on the horizontal x-axis whereas as its sine value lies on the y-axis. Answer: sin (120°) = 0.8660254038. sin (120°) is exactly: √3/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 120 degrees - sin (120 °) - or the sine of any angle in degrees and in radians. To find the value of sin 225 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 225° angle with the positive x-axis. The sin of 225 degrees equals the y-coordinate (-0.7071) of the point of intersection (-0.7071, -0.7071) of unit circle and r. Hence the value of sin 225° = y = -0.7071 (approx)

For sin 70 degrees, the angle 70° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 70° value = 0.9396926. . . ⇒ sin 70° = sin 430° = sin 790°, and so on. Note: Since, sine is an odd function, the value of sin (-70°) = …

Answer: sin (-150°) = -0.5. sin (-150°) is exactly: -1/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of -150 degrees - sin (-150 °) - or the sine of any angle in degrees and in radians. The value of sin 330 degrees is -0.5. Sin 330 degrees in radians is written as sin (330° × π/180°), i.e., sin (11π/6) or sin (5.759586. . .). In this article, we will discuss the methods to find the value of sin 330 degrees with examples. Sin 330°:-0.5; Sin 330° in fraction:-(1/2) Sin (-330 degrees): 0.5; Sin 330° in radians: sin (11π ...The sine is a trigonometric function of an angle, usually defined for acute angles within a right-angled triangle as the ratio of the length of the opposite side to the longest side of the triangle. In the illustration below, sin(α) = a/c and sin(β) = b/c. From cos(α) = a/c follows that the sine of any angle is always less than or equal to ...A tangent of an angle α is also equal to the ratio between its sine and cosine, so tanα = sinα / cosα. Following from the definition, the function results in an undefined value at certain angles, like 90°, ... Our tangent calculator accepts input in degrees or radians, so assuming the angle is known, ... 150 ° 5π/6-0.577350: 180 ...To find the value of sin 225 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 225° angle with the positive x-axis. The sin of 225 degrees equals the y-coordinate (-0.7071) of the point of intersection (-0.7071, -0.7071) of unit circle and r. Hence the value of sin 225° = y = -0.7071 (approx)Search for the angle 150 ° 150\degree 150°. As we learned before – sine is a y-coordinate, so we take the second coordinate from the corresponding point on the unit circle: sin ⁡ ( 150 ° ) = 1 2 \qquad \sin(150\degree) = \frac{1}{2} sin ( 150° ) = 2 1Investors may want to turn toward these sin stocks as they offer high dividend yields and resistance against recessions. These sin stocks are undervalued and offer high yields Sour...Calculate the value of sin 150 °: First, determine the sign of sin 150 °. It is clear that 150 ° belongs to the second quadrant. It is known that the values of sines are positive + in the …The value of sin 15° can be found by making an angle of 15° with the x-axis and then finding the coordinates of the corresponding point (0.9659, 0.2588) on the unit circle. The value of sin 15° is equal to the y-coordinate (0.2588). Thus, sin 15° = 0.2588. 3. What is the value of sin 60° + sin 15°? You know that.

Labor and delivery bulletin board ideas.

Issa final exam answers 2023.

What is the value of sin(150) ? The value of sin(150) is 1/2 Study Tools AI Math Solver Popular Problems Worksheets Study Guides Practice Cheat Sheets Calculators Graphing Calculator Geometry CalculatorAnswer: sin (190°) = -0.1736481777. Note: angle unit is set to degrees. Use our sin (x) calculator to find the sine of 190 degrees - sin (190 °) - or the sine of any angle in degrees and in radians.Answer: sin (135°) = 0.7071067812. sin (135°) is exactly: √2/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 135 degrees - sin (135 °) - or the sine of any angle in degrees and in radians.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees. secant. the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/cos (θ) sin. sin (θ) is the ratio of the opposite side of angle θ ...150° lies in the 2nd Quadrant. Therefore sin (180° – θ) = sin θ. sin (150°) = sin (180° – 30°) sin (150°) = sin (30°) sin (150°) = 1/2 So the exact value of sin 150° is 1/2. Similar Questions. Question 1: Find the value of sin 135°. Solution: Since, we know that sin is positive in the 1st and 2nd Quadrant,The tan of 150 degrees is -√ (3)/3, the same as tan of 150 degrees in radians. To obtain 150 degrees in radian multiply 150° by π / 180° = 5/6 π. Tan 150degrees = tan (5/6 × π). Our results of tan150° have been rounded to five decimal places. If you want tangent 150° with higher accuracy, then use the calculator below; our tool ...sin(A – B) = [sin(A).cos(B)] – [cos(A).sin(B)] How do I find the value of sin 150° in fraction form? Solution: Method 1: sin(150°) We can write 150° as 180° – 30° So, sin(150°) = sin(180° – 30°) But we know that, sin(n×180° – θ) = sin(θ) So, sin(150°) = sin(180° – 30°) = sin(30°) = 1/2. Thus, sin(150°) = 1/2. Method 2:Dec 26, 2023 · 150° lies in the 2nd Quadrant. Therefore sin (180° – θ) = sin θ. sin (150°) = sin (180° – 30°) sin (150°) = sin (30°) sin (150°) = 1/2 So the exact value of sin 150° is 1/2. Similar Questions. Question 1: Find the value of sin 135°. Solution: Since, we know that sin is positive in the 1st and 2nd Quadrant, Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ... ….

sin 30° = 0.5. sin 30 degrees = 0.5. The sin of 30 degrees is 0.5, the same as sin of 30 degrees in radians. To obtain 30 degrees in radian multiply 30° by π / 180° = 1/6 π. Sin 30degrees = sin (1/6 × π). Our results of sin30° have been rounded to five decimal places. If you want sine 30° with higher accuracy, then use the calculator ...Answer: sin (330°) = -0.5. sin (330°) is exactly: -1/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 330 degrees - sin (330 °) - or the sine of any angle in degrees and in radians.A mortal sin is the most serious type of sin in Christianity. Types of mortal sin include idolatry, adultery, murder and slander. These sins are more serious than venial sins becau...Answer: sin (150°) = 0.5. sin (150°) is exactly: 1/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 150 degrees - sin (150 °) - or the sine of any angle in degrees and in radians. Answer: sin (120°) = 0.8660254038. sin (120°) is exactly: √3/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 120 degrees - sin (120 °) - or the sine of any angle in degrees and in radians. \sin (x)+\sin (\frac{x}{2})=0,\:0\le \:x\le \:2\pi \cos (x)-\sin (x)=0 \sin (4\theta)-\frac{\sqrt{3}}{2}=0,\:\forall 0\le\theta<2\pi ; 2\sin ^2(x)+3=7\sin (x),\:x\in[0,\:2\pi ] 3\tan … Answer: sin (115°) = 0.906307787. Note: angle unit is set to degrees. Use our sin (x) calculator to find the sine of 115 degrees - sin (115 °) - or the sine of any angle in degrees and in radians. To convert degrees to radians, you can use the following formula: radians = π/180° × degrees. For instance, if you were trying to determine what is a 90° angle in radians, you would compute the following calculations: radians = π/180° × 90° = π/2 rad ≈ 1.5708 rad. Sounds cumbersome?= cos (90°+150°) = cos 240°. = sin (180°+150°) = sin 330°. Note that sin150° is periodic: sin (150° + n × 360°) = sin 150 degrees, n ∈ Z. There are more formulas for …Calculate cos(150) cos is found using Adjacent/Hypotenuse. Determine quadrant: Since 90 150 180 degrees it is located in Quadrant II. sin is positive. Determine angle type: 150 > 90°, so it is obtuse. cos(150) = -√ 3 /2. Excel or Google Sheets formula: Excel or Google Sheets formula:=COS(RADIANS(150)) Special Angle Values Sin 150 degrees in fraction, Other interesting angles are 30\degree 30° and 60\degree 60°, as they appear in other special right triangles. For these angles, we have the sine of 30 and the …, For sin 90 degrees, the angle 90° lies on the positive y-axis. Thus, sin 90° value = 1. Since the sine function is a periodic function, we can represent sin 90° as, sin 90 degrees = sin (90° + n × 360°), n ∈ Z. ⇒ sin 90° = sin 450° = sin 810°, and so on. Note: Since, sine is an odd function, the value of sin (-90°) = -sin (90°)., Use our sin(x) calculator to find the exact value of sine of 150 degrees - sin(150 °) - or the sine of any angle in degrees and in radians. , Medicine Matters Sharing successes, challenges and daily happenings in the Department of Medicine ARTICLE: Cellular and molecular pathobiology of heart failure with preserved eject..., My Delano Las Vegas review goes over all of the ins and outs of one of the most underrated properties in sin city. A great Amex FHR option. Increased Offer! Hilton No Annual Fee 70..., Answer: sin (190°) = -0.1736481777. Note: angle unit is set to degrees. Use our sin (x) calculator to find the sine of 190 degrees - sin (190 °) - or the sine of any angle in degrees and in radians. , Popular Problems. Precalculus. Find the Value Using the Unit Circle 150 degrees. 150° 150 °. Evaluate cos(150°) cos ( 150 °). Tap for more steps... − √3 2 - 3 2. Evaluate sin(150°) sin ( 150 °). Tap for more steps..., FAQs on Cos 150 Degrees What is Cos 150 Degrees? Cos 150 degrees is the value of cosine trigonometric function for an angle equal to 150 degrees. The value of cos 150° is −√3/2 or -0.866 (approx) What is the Value of Cos 150 Degrees in Terms of Tan 150°? We know, using trig identities, we can write cos 150° as -1/√(1 + tan²(150 ... , sin(225) sin ( 225) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. −sin(45) - sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. − √2 2 - 2 2. The result can be shown in multiple forms., Trigonometry. 1 Answer. KillerBunny. May 16, 2018. cos(150) = − √3 2. sin(150) = 1 2. Explanation: First of all, observe that 150 = 180 −30. Then, remember …, To find the value of sin 10 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 10° angle with the positive x-axis. The sin of 10 degrees equals the y-coordinate (0.1736) of the point of intersection (0.9848, 0.1736) of unit circle and r. Hence the value of sin 10° = y = 0.1736 (approx), Find the Exact Value sin (135 degrees ) sin(135°) sin ( 135 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(45) sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. √2 2 2 2. The result can be shown in multiple forms. Exact Form: √2 2 2 2. , For sin 90 degrees, the angle 90° lies on the positive y-axis. Thus, sin 90° value = 1. Since the sine function is a periodic function, we can represent sin 90° as, sin 90 degrees = sin (90° + n × 360°), n ∈ Z. ⇒ sin 90° = sin 450° = sin 810°, and so on. Note: Since, sine is an odd function, the value of sin (-90°) = -sin (90°)., Calculate the value of the sin of -15 ° To enter an angle in radians, enter sin (-15RAD) sin (-15 °) = -0.258819045102521 Sine, in mathematics, is a trigonometric function of an angle. The sine of ... As one of the previous post mentioned, sin (1.5) is irrational so the exact value of it is in fact sin (1.5)., \sin (x)+\sin (\frac{x}{2})=0,\:0\le \:x\le \:2\pi \cos (x)-\sin (x)=0 \sin (4\theta)-\frac{\sqrt{3}}{2}=0,\:\forall 0\le\theta<2\pi ; 2\sin ^2(x)+3=7\sin (x),\:x\in[0,\:2\pi ] 3\tan …, Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor., Order of Operations Factors & Primes Fractions Long Arithmetic Decimals Exponents & Radicals Ratios ... degrees-to-radians-calculator. sin 150. en. Related Symbolab ..., Cos 30 degrees is written as cos 30° and has a value in fraction form as √3/2. Cos 30° = √3/2. Cos 30° = √3/2 is an irrational number and equals to 0.8660254037 (decimal form). Therefore, the exact value of cos 30 degrees is written as 0.8660 approx. √3/2 is the value of Cos 30° which is a trigonometric ratio or trigonometric ..., For sin 300 degrees, the angle 300° lies between 270° and 360° (Fourth Quadrant ). Since sine function is negative in the fourth quadrant, thus sin 300° value = - (√3/2) or -0.8660254. . . ⇒ sin 300° = sin 660° = sin 1020°, and so on. Note: Since, sine is an odd function, the value of sin (-300°) = -sin (300°)., The sine of theta (sin θ) is the hypotenuse's vertical projection (green line); and; The cosine of theta (cos θ) is the hypotenuse's horizontal projection (blue line). We can rotate the radial line through the four quadrants and obtain the values of the trig functions from 0 to 360 degrees, as in the diagram below:, Other interesting angles are 30\degree 30° and 60\degree 60°, as they appear in other special right triangles. For these angles, we have the sine of 30 and the sine of 60 degrees. sin ⁡ ( 30 °) = 1 / 2. \sin (30\degree) = 1/2 sin(30°) = 1/2. sin ⁡ ( 60 °) = 3 / 2. \sin (60\degree) = \sqrt {3}/2 sin(60°) = 3. ., Evaluate sin(150) Step 1. Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Step 2. The exact value of is . Step 3. , As the y coordinate is 0.5, sin 30° = 0.5. Why is sine 150 degrees equal to sin 30 degrees? 150° = 180°-30° So sine 150 degress is equal to sine 30 degrees because 150 degrees is in the second quadrant where sine is positive and the related angle is 30 degrees. Equivalent values of sin 30. These are some other values which sine 30 can be ..., Search Results related to value of sin 150 degree in fraction on Search Engine, Calculate the value of sin 150 °: First, determine the sign of sin 150 °. It is clear that 150 ° belongs to the second quadrant. It is known that the values of sines are positive + in the second quadrant. It is also known that, sin (180-x) ° = sin x °. Thus, sin 150 ° = sin 180-30 ° = sin 30 ° = 1 2. Therefore, the value of sin 150 ..., Considering a human resources degree, but not sure what you can do with one? Explore our guide to everything you should know about HR degrees. Written by TBS Staff Contributing Wri..., Cos 15 Degrees. The value of cos 15 degrees is 0.9659258. . ..Cos 15 degrees in radians is written as cos (15° × π/180°), i.e., cos (π/12) or cos (0.261799. . .). In this article, we will discuss the methods to find the value of cos 15 degrees with examples., Want to invest with just a few bucks? Read our Webull fractional shares review to find out if this trading platform is a good fit for you. Want to invest with just a few bucks? Rea..., Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ..., 15° 15 °. To convert degrees to radians, multiply by π 180° π 180 °, since a full circle is 360° 360 ° or 2π 2 π radians. 15°⋅ π 180° 15 ° ⋅ π 180 ° radians. Cancel the common factor of 15 15. Tap for more steps... π 12 π 12 radians., The value of cot 150 degrees can be calculated by constructing an angle of 150° with the x-axis, and then finding the coordinates of the corresponding point (-0.866, 0.5) on the unit circle. The value of cot 150° is equal to the x-coordinate (-0.866) divided by the y-coordinate (0.5). ∴ cot 150° = -1.7321. Download FREE Study Materials., Answer: sin (300°) = -0.8660254038. sin (300°) is exactly: -√3/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 300 degrees - sin (300 °) - or the sine of any angle in degrees and in radians., Trigonometrical ratios of some particular angles i.e., 120°, -135°, 150° and 180° are given below. 1. sin 120° = sin (1 × 90° + 30°) = cos 30° = √3/2;