tan ^3theta -1/tan theta -1=sec^2theta +tan theta
Prove that lhs =rhs
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(tan³theta-1)/(tan theta-1)
by using formula
(a³-b³)= (a²+b²+ab)
= (tan theta-1)(tan²theta+1+tan theta)/(tan theta-1)
= tan²theta+1+tan theta
= sec²theta+tan theta
= RHS
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