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Prove that ((sin 7 x+sin 5 x)+(sin 9 x+s...

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

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V PUBLICATION-TRIGNOMETRC FUNCTIONS-QUESTION BANK
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