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Prove that in any DeltaABC, (b-c)cot"...

Prove that in any `DeltaABC`, `(b-c)cot""(A)/(2)+(c-a)cot""(B)/(2)cot""(C)/(2)=0`.

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CHHAYA PUBLICATION-MISCELLANEOUS EXAMPLES-HS (XI) AND WBJEE 2018 (GROUP - C)
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  2. Prove that in any DeltaABC, (b-c)cot""(A)/(2)+(c-a)cot""(B)/(2)cot"...

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  3. Solve : secx-tanx=sqrt3.

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