tan 3 cube theta-1
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tan theta-1=sec 2theta +tantheta
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Step-by-step explanation:
LHS= tan theta-1
= sin theta/cos theta - 1
= sin theta - cos theta/cos theta
RHS= sec 2 theta+ tan theta
= 1/cos2 theta + sin theta/cos theta
= 1+ sin theta cos theta/ cos2theta
= 1 + sin theta cos theta/ 1- sin2 theta
= cos theta/ 1 - sin theta
= sin theta - cos theta/ cos theta
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