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inttan^-1sqrt((1-cos2x)/(1+cos2x))dx...

`inttan^-1sqrt((1-cos2x)/(1+cos2x))dx`

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`I=inttan^-1sqrt((1-cos2x)/(1+cos2x))dx`
=`inttan^-1(sinx/cosx)dx`
=`inttan^-1(tanx)dx`
=`intxdx=x^2/2+c`
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