Question
Sun March 04, 2012 By:
 

State sinA+sinB=sin[a+b] is true or false please justify your answer

Expert Reply
Sun March 04, 2012
It is not true, in general. This relation is true for some particular values of A and B.
For example, if A = 0 and B = 90,
Then, Sin (A+B) = sin (0+90) = sin 90 = 1
And, sin A + sin B = sin 0 + sin 90 = 0 + 1 = 1
Hence, sin (A+B) = sin A + sin B
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