Prove that 1+cosx=2cos^2(x/2) and 1-cosx=2sin^2(x/2) trigonometric identites
1-cosx = 2sin^2(x/2) trigonometric identites proof || 1-cos theta
Proof of the identity 1 + cot^2(theta) = cosec^2(theta) |Proved cot^2(x) + 1 = cosec^2(x)
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