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Trigonometric Identities


Problems

Problem : Prove the following identity: tan(θ)cos(θ) = sin(θ)


Problem : Prove the following identity: (sin(θ))4 +2(sin(θ))2(cos(θ))2 + (cos(θ))4 = tan(θ)cot(θ)


Problem : Prove the following identity: - cos(θ)(cot(θ))2 = cot(θ)sin(θ)