# Prove that [(sin 7x + sin 5x ) + (sin 9x + sin 3x )] / [(cos 7x + cos 5x ) + (cos 9x + cos 3x )] = tan 6x

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Prove that [(sin 7x + sin 5x ) + (sin 9x + sin 3x )] / [(cos 7x + cos 5x ) + (cos 9x + cos 3x )] = tan 6x

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Proof is given as:

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