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In any triangle A B C , prove that follo...

In any triangle `A B C` , prove that following: `sin((B-C)/2)=(b-c)/acosA/2`

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We know that, for a given triangle, the sum of all the interior angles of a triangle is equal to `180°`

`A + B + C = 180°` …………………..(1)

To find the value of `(B + C)/2`, simplify the equation (1)

⇒ `B + C = 180° – A`

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