Trigonometric EquationMedium
Question
(sin 3A + sinA) sin A + (cos3A - cosA) cos A = ....
Options
A.sinA
B.cosA
C.1
D.0
Solution
(sin 3A + sin A) sin A + (cos 3A - cos A) cos A
= 2sin 2A cos A sin A + 2 sin 2A sin (-A) cos A
= 0
= 2sin 2A cos A sin A + 2 sin 2A sin (-A) cos A
= 0
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