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Step-by-step explanation:
Lhs:
(1+sin^2θ+2sinθ+1+sin^2θ-2sinθ)/2cos^2θ
=(2+2sin^2θ)/2cos^2θ
=(1+sin^θ)/cos^2θ
=(1+sin^2θ)/(1-sin^2θ)=rhs
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