IIT-JEE Exam

prove:
sin (A + B) =sin A cos B + cos A sin B

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IIT-JEE Other Question

Prove that , cos 510 cos330 +sin 390 cos 120
= –1 If sin A =
3
5
and cos B =
9
41
, 0 < A <
π
2
.
0 < B <
π
2
, find the values of the following -
(a) sin (A + B)
(b) cos (A – B)