Find the exact value of the expression.sin 15°

A. - 
B.
C. - 
D.

Answer: D

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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)

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Express the sum or difference as a product of sines and/or cosines.sin  + sin 

A. 2 sin (5?)
B. 2 cos (5?) sin ?
C. 2 sin  sin ?
D. 2 sin  cos ?

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Find the exact value of the expression.tan 105°

A.
B.
C. -2 - 
D. 2 + 

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Solve the problem.If sin ? = - , and ? terminates in quadrant IV, then find sin 2?.

A.
B. - 
C. - 
D.

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