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सिद्ध कीजिए कि (sin 7A - 2 sin 4A +...

सिद्ध कीजिए कि
` (sin 7A - 2 sin 4A + sin A)/(cos 7A - 2 cos 4A + cos A)= tan 4A .`

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( sin A + sin 3A + sin 5A + sin 7A)/(cos A + cos 3 A + cos 5 A + cos 7A) = tan 4A.

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