tanA +1/tanA = secA. cosecA
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LHS= tan A+1/tan A
= sin A/Cos A+cos A/sin A
=sin square A + cos square A/cos A×Dina
=1/ cos A ×sin A
=1/ cos A ×1/sin A
=sec A .cosecA=RHS
therefore ,LHS =RHS
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