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prove that sin x+sin3x+sin5x+sin7x=4cosx cos2x sin 4x

Asked by Gowtham(student), on 13/10/12



(sin 3x +  sin 5x)  +  (sin 7x  +  sin x )

2 sin 4x . cos x +  2 sin 4x . cos 3x

2 sin 4x (cos x+ cos 3x)

2 sin 4x (2 cos 2x . cos x)

2 cos 2x . cos x . sin 4x

Posted by pallintimanish....(student), on 14/10/12
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