PreCalculus - Trigonometry: Trig Identities (31 of 57) Proof cos^2(x)=(1+cos2x)/2

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Evaluate the integral : ∫ √(1 - cos2x)/(1 + cos2x) dx

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USE OF FORMULA 1-cos2x=2sin²x AND 1+cos2x=2cos²x

Prove that 1+cosx=2cos^2(x/2) and 1-cosx=2sin^2(x/2) trigonometric identites

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