1.

Cos? + cos? =

A. ?2sin(? + ?/2)sin(?-?/2)
B. 2cos(? + ?/2)sin(?-?/2)
C. 2cos(? + ?/2)cos(?-?/2)
D. None of Above
Answer» B. 2cos(? + ?/2)sin(?-?/2)


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