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Question

Prove that sinθ+sin2θ1+cosθ+cos2θ=tanθ

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Solution

(sinθ+sin2θ1+cosθ+cos2θ)=(sinθ+2sinθcosθ1+cos2θ+cosθ)=(sinθ(1+2cosθ)1+2cos2θ1+cosθ)=(sinθ(1+2cosθ)cosθ(1+2cosθ))=tanθ=RHS


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