Question

what is the answer for : SinA × SinB = ?​

Answer 1

Answer:

SinA +SinB is 2×{Sin[(A+B)/2]}×{Cos[(A-B)/2]}. Putting the values of A and B as per question you can find the answer. It is 2sin((A+B)/2)cos((A-B)/2). The result follows from the results of multiple angle formulas of trigonometry.

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Answer 2

Answer:

sina sinb = 1. 2(cos(a − b) − cos(a + b))