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11.4 Double and Half Angles cot x= sin2x/1-cos2x
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USE OF FORMULA 1-cos2x=2sin²x AND 1+cos2x=2cos²x
Integration 1/1-cos2x dX =
cos²x = 1/2(1+cos2x)
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Evaluate the integral : ∫ √(1 - cos2x)/(1 + cos2x) dx
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