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

Asked by  | 4th Mar, 2012, 02:35: PM

Expert Answer:

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

Answered by  | 4th Mar, 2012, 03:17: PM

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