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(sin^(2)x)/(1+cos x)...

`(sin^(2)x)/(1+cos x)`

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Given `int(sin^2x)/(1+cosx)dx`
`=int((1-cos^2x)/(1+cosx))dx`
`=int((1^2-cos^2x)/(1+cosx))dx`
`=int(((1-cosx)(1+cosx))/(1+cosx))dx`
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