What is cos 2A, if cos 2A = 5/8, and 2A is an angle in the fourth quadrant?

Q: If the terminal side of angle 0 goes through the point VTO 3VT0 10 on the unit circle, then what is…

A: We have to find the length of hypotenuse at first.Then to find the value of cos (theta)

Q: θ

A: Please refer to the image below

Q: what is the exact value of cos (22.5*) using the half angle identites

A: The exact value of cos (22.5*) using the half angle identities

Q: Suppose that sin α = 12/13 for a quadrant II angle α and sin β = 3/5 for a quadrant I angle β. Find…

A: Given,  sin α = 12/13                [angle α is in a quadrant II]  sin β = 3/5…

Q: In terms of the cosine of a positive acute angle, what is the expression for cos(19pie/18)?

A: Cos 19π/18                     = cos 19*180/18                    = cos 190° cos190° = -0.98481cos…

Q: Use an appropriate Half-Angle Formula to find the exact value of the expression. cos(5) 12.

A:

Q: If sin © = cos 23°, O = ?

A: Given: sinθ=cos23° To find: θ = ?

Q: what is the exact value of sin (165*) using the half angle identities

A:

Q: Use the given information to find the exact value of the expression. cos θ = 15/17, θ lies in…

A: Answer(a)

Q: 8. and If sin a =- 17 cos ß = for a second-quadrant angle a and a third-quadrant angle ß, find the…

A: solution is given below..

Q: Suppose cos 2 A , and 2A is an angle in the Second Quadrant. Then cos A Give the EXACT value.

A:

Q: Find the exact values of the six trigonometic functions for the following angle sin 30 degree?

A: It is known that, π/3=30◦Sketch the graph of the unit circle as follows.

Q: The value of ( cos 30 sin 60 de is 4

A:

Q: Use the double angle formula to find the exact value of 2 cos² ETOO 1

A:

Q: In terms of the cosine of a positive acute angle, what is the expression for cos(19π/18)

A:

Q: Use the half-angle formula to simplify the given expression. 1 + cos 12x 2

A: The given expression is:1+cos12x2We need to simplify the above expression using half-angle formula.

Q: What is cos 12 degrees to the nearest tenth?

A: so nearest tenth place is 7.

Q: If the terminal side of angle θ is in the first quadrant and cos ( θ ) = 1, what is the exact…

A: If the terminal side of angle θ is in the first quadrant and cos ( θ ) = 1,

Q: Use a compound angle formula to rewrite cos(30) in terms of sinO and / or cose.

A: compound angle formula

Q: Find the smallest positive angle such that sin 2a = cos 3a %3|

A: As per our guidelines we can solve only one question. Rest question can be reposted.  Here in…

Q: If in right AABC with right angle at C, cos B : then what is the value of cos A?

A:

Q: 2. In this triangle, what is equivalent to cos A? cos B sin(90-B) O sin A sin(90-A)

A:

Q: What is the reference angle associated with cos 240o ?

A: Answer is- -1/2 Explanation is given below....

Q: If sin θ = 4 / 5 and θ is in quadrant II, then cos θ =

A: We know that in the second quadrant, sine is positive and cosine is negative. Also, sin2x+cos2x=1.

Q: the terminal side of angle θ goes through the point ( 1517 , −817 ) on the unit circle, then what is…

A: We have to find the value of costheta

Q: Find cos (2 θ) , if sin θ=15/17 and θ lies in quadrant I

A: sin² (x) + cos² (x) = 1 cos(2x) = cos² (x) - (1 - cos²(x)) = 2cos²(x) - 1

Q: Use a reference angle to find the exact value of cos 210 degree        -1/2

A: Let the given cosing angle be y - y = cos210Angle 210° lies in the third quadrant.So, we can take…

Q: An angle of measure 150∘ intersects the unit circle at point (−32,12). What is the exact value of…

A:

Q: Given cos⁡(θ)=3/5 and tan⁡(θ)<0 what is the value of sin⁡(θ)?

A: Explanation of the answer is as follows

Q: Suppose cos 2A = and 2A is an angle in the Third Quadrant. | 7' Then cos A

A: The trigonometric identity for cosine is cos 2x=2cos2 x−1.

Q: What is the value of cos(6) if the terminal side of the angle 0 intersects a circle at the point…

A: It can be solved using the fact that cose angle is adjacent/hypotenuse

Q: Suppose that , is an angle in quadrant 4 and that cos a = 7 Compute the exact value of 2 25 cos cos…

A:

Q: Given that cos(0) = 2/13 18, and 0 is in Quadrant IV, what is cos(20)? %3D

A: We can use the following standard trigonometric identity given below: cos(2θ)=2cos2(θ)-1......(i)…

Q: Given that sin(0) = -, and 0 is in Quadrant III, what is cos(20)? 24 25

A:

Q: If cos(θ)=−1/19cos and θ is in the 3rd quadrant, find the exact value of sin(θ)

A:

Q: If θ is an acute angle and cos θ = 1/3, find csc (π/2 - θ).

A: It is given that,cos θ = 1/3 We have to find  csc (π/2 - θ).

Q: If theta = arctan(1) and 180deg < theta < 360deg, what is cos theta?

A:

Q: The angle 0 is in standard position, passing through the point (6, -8). What is the value of cos 0?…

A: Given: a=6,b=-8

Q: Use the formula for the cosine of the difference of two angles to find the exact value of expression…

A: We have formula, cosA-B=cosA cosB+sinA sinB. Using above formula, we will evaluate the expression…

Q: By applying the compound angles and without using a calculator determine the value of Cos15°

A:

Q: Assume that θ is a positive acute angle. Given: cos⁡θ=60/61 Find: cos⁡2θ

A:

Q: Use a half-angle formula to find the exact value of the expression cos 157.5°

A:

Q: An angle of measure 60∘ intersects the unit circle at point (12, 32). What is the exact value of…

A:

Q: Use a half-angle formula to find the exact value of cos 22.5°.

A:

Q: Use a half-angle formula to find cos 75 degree.

A: We have to find exact value of cos 75° by using half angle formula. We know half angle formula for…

Q: Suppose cos 2A and 2A is an angle in the First Quadrant. 9. Then cos A %3D

A: We know that 1+cos2x = 2cos2x ⇒cosx=±1+cos2x2 Sign will be according to quadrant in which x belongs…

Q: Find the exact value of cos 240' using the compound angle formula. 1 ,and A is in the fourth…

A: Solution : a) We have to find out the exact value of cos240° using the compound angle formula. b)…