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Evaluate int(1-cos2x)/(1+cos2x)dx....

Evaluate `int(1-cos2x)/(1+cos2x)dx.`

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`int(1-cos2x)/(1+cos2x)=int(2sin^2x)/(2cos^2x)dx=inttan^2xdx=int(sec^2x-1)dx=tanx-x+C`
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