1.

\frac { \operatorname { cot } \theta - \operatorname { cos } \theta } { \operatorname { cot } \theta + \operatorname { cos } \theta } = \frac { \operatorname { cosec } \theta - 1 } { \operatorname { cosec } \theta + 1 }

Answer»

now sintheta=1/cosecthetahence rhs will.be cosectheta-1/cosectheta+1



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