1.

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

Answer»

in LHS multiply with cosec theta+cot thetaso it would be cosec theta+ cot theta/cosec^2theta-cot^2thetaas we know cosec^2 theta- cot^2 theta=1we got it same as RHs

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