सिद्ध कीजिए कि (cos 5A * cos 8A - co...

सिद्ध कीजिए कि
` (cos 5A * cos 8A - cos 12 A* cos 9A)/(sin 8A * cos 5A + cos 12A * sin 9A)= tan 4A`

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(cos 8 A cos 5A-cos 12 A cos 9A)/(sin 8 A cos 5 A +cos 12Asin 9A)=

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cos A * cos2A * cos4A * cos8A * cos16A * cos32A = (sin (64A)) / (64sin A)