to 11. If sin 18 0.309, determine the value of cos 72.

Q: sin40= .643, sin25 = .422, cos40 = .766, and cos25 = .906, calculate the following: Sin15 and sin80

A: Given query is to find indicated angles.

Q: 3.) Use Valve an identity to find the the expression.. of the Sec²80-tan ²80 ?

A:

Q: Use a calculator to find 0 to the nearest tenth of the degree, if 0° < 0 < 360° and cos 0 = 0.5150…

A:

Q: Which of the following is an equivalent expression to sin - (sin )(cos²0)? O cos²e O cos³e O sin²e O…

A: Given expression      sin(θ)-(sin(θ))(cos2(θ)) Here we use the following identity:…

Q: Hence or otherwise find the exact value of 2 sin 285 cos 45

A: Given  To find exact value of 2sin285 cos 45   Using formula

Q: If 8 is in the third quadrant and sin 8 = -3, what is cos(0)? 5' Determine your answer without using…

A: Topic = Trigonometry

Q: 23 Select the correct answer. What is the exact value of cos 112.5 ? 2 V2 O B. V2+2 C. V2 + v2 4 O…

A: To find:-  Exact value of cos(112.5°)

Q: 23. tan 4x 3 24. CSc 117 6 25. cos 2π 3

A: To solve the following

Q: Verify that the equation is an identity: sin (0-4) -Cos 0 nd the exact value of each expression. tan…

A:

Q: 1. sin(csc0-sin) = cos²0 2. tan² (1+cot²0)= sec 0

A: Given :1) sinθ(cscθ-sinθ)=cos2θ2)tan2θ(1+cot2θ)=sec2θ   To verify : Identities given

Q: 18. Suppose < 0 <n and sin 0 = Evaluate cos 0

A:

Q: Evaluate. cos 2a if 2 cos 3α = cos a

A: ​cos(2α)=−1,43​​Explanation:Step 1:​Given: 2cos(3α)=cosαTo find: cos(2α)​Step 2:​2cos(3α)=cosαUsing…

Q: c. If cos 0 + 4 =2, find 0.

A: