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Delta ABC में सिद्ध कीजिए कि a(cosB+...

` Delta ABC` में सिद्ध कीजिए कि
` a(cosB+cosC) = 2 (b+c) sin^(2) .A/2`

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In Delta ABC prove that a(cosB + cosC) = 2(b+c) sin^2(A/2)

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