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Prove that : sin(90° - θ)sin θ/tan θ - 1 = -sin2 θ
सिद्ध कीजिए कि sin (90 - theta) cos (90 - theta) = (tan theta)/(1 + tan^2 theta), 10
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Prove that: (sin θ - 2 sin^3 θ) / (2 cos^3 θ - cos θ) = tan θ [Video]
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