((sin 7x + sin 5x ) +(sin 9x + sin 3x))/...

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

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OSWAAL PUBLICATION-SOLVED PAPER 2018-2-EXERCISE

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