Cos 3x.sin 9x - sinx . Cos 5x
Cos x . Cos 5x - sin 3x .sin 9x
= tan 8x
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Answer:
`(( sin 7x + sin 5x)+(sin 9x + sin 3x))/((cos 7x + cos 5x)+(cos 9x+ cos 3x)) =tan 6x`
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