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Integrate the functions(sinx)/((1+cosx)^...

Integrate the functions`(sinx)/((1+cosx)^2)`

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` int (sin x)/( (1+ cos x)^(2))dx " " underset( rArr sin x dx=-dt)underset( rArr - sin x dx = dt)(" Let " 1+ cos x =t)`
`=int -(dt)/( t^(2)) `
`=(1)/(t)+c =(1)/( 1+cos x)+c`
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