1.

In DeltaABC,(b-c)/(b+c)cot""A/2+(b+c)/(b-c) tan""A/2=

Answer»

` 2 COSEC (B-C) `
` cosec (B-C) `
` cosec ((B-C)/( 2))`
` cosec ((B+C)/(2))`

ANSWER :A


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