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सिद्ध कीजिए कि sin (A + 2B) sin A - s...

सिद्ध कीजिए कि
` sin (A + 2B) sin A - sin B sin (2A +B)`
` = sin (A+B) sin (A-B)`

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sin A sin (A + 2B) -sin B sin (B + 2A) = sin (AB) sin (A + B)

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