Question

_cosb = 1/2 (sin(a+b) + sin(a+b))

Answer 1

(sina)cosb=1/2[sin(a+b)+sin(a-b)]

Explanation:

Be sure that when you type your answer, you dont put the parentheses around sina.

You should type sina

Answer 2

Explanation:

2 cosA sinB = sin(A + B) − sin(A − B) 2 cosA cosB = cos(A + B) + cos(A − B)