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b-c // b+c cot A/2 + b+c // b-c tan A/2 ...

`b-c // b+c cot A/2 + b+c // b-c tan A/2 = 2 cosec (B-C)`అని చూపండి.

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The correct Answer is:
`2 cosec (B-C)` = R.H.S.
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