tan^4A+tan^2A=sec^4A-sec^2A
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Take LHS
tan^2(tan^2+1)=sec^2-1(sec^2)
=sec^4-sec^2
So RHS=LHS
tan^2(tan^2+1)=sec^2-1(sec^2)
=sec^4-sec^2
So RHS=LHS
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