(sin^3 theta + cos^3 theta) ÷ (sin theta + cos theta)
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sin^3θ+cos^3θ=(sinθ+cosθ)sin^2+cos^2θ-sinθcosθ)
(sin^3 θ + cos^3 θ) ÷(sin θ+ cos θ) =(sinθ+cosθ)sin^2+cos^2θ-sinθcosθ)÷(sin θ+ cos θ)
=1-sinθcosθ
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