Complete the identity.cos (? + ?) cos (? - ?) = ?
A. 2 - sin2? - sin2?
B. cos2? - sin2?
C. cos2? - 2 sin2? sin2?
D. cos (?2) cos (?2) + sin (?2) sin (?2)
Answer: B
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Provide an appropriate response.Evaluate 
Fill in the blank(s) with the appropriate word(s).
Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.sin ? = - 
, 
< ? < 2?Find sin 
.
A. 
B. - 
C. - 
D. - 
Write the trigonometric expression as an algebraic expression containing u and v.cos (sin-1 u + cos-1 v)
A. v
+ u
B. uv + (
)(
)
C. uv - (
)(
)
D. v
- u
Express the product as a sum containing only sines or cosines.cos (5?) cos (4?)
A. 
[cos (9?) - cos ?]
B. 
[ cos ? + cos (9?)]
C. 
[cos (9?) - sin ?]
D. cos2 (20?2)