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Grade: 8
        SIN A + SIN 3A + SIN 5A + SIN 7A = ? PLSSS GIVE ME A PROPER EXPLANATION OF THE ANSWER..
2 years ago

Answers : (1)

Arun
23328 Points
							
Dear Ritika
 
(Sin A + sin7A ) + (sin3A+ sin5A)
= 2 sin 4A cos 3A + 2 sin4A cosA
= 2 sin4A( cos3A + cosA)
= 2 sin4A * 2 cos 2A cos A
= 4 sin2A cos A cos 2A
 
Regards
Arun (askIITians forum expert)
2 years ago
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