tan4 thita +tan 2 thita=sec4 thita-sec2thita
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Step-by-step explanation:
LHS:
sec
4
θ−sec
2
θ
=sec
2
θ(sec
2
θ−1)
=(1+tan
2
θ)tan
2
θ
=tan
2
θ+tan
4
θ
Hence LHS = RHS.
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