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Prove that sin 5A + sin 3A = 2sin 4A cos A

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Prove that sin 5A + sin 3A = 2sin 4A cos A

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L.H.S. sin 5A + sin 3A = 2sin 4A cos A = R.H.S.

[∵ sin C + sin D = 2 sin C + D/2 cos C-D/2]

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