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Evaluate : int0^pi1/(1+sinx)dx...

Evaluate : `int_0^pi1/(1+sinx)dx`

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`int_0^pi 1/(1+sinx)dx`
`=>int_0^(pi)/2(1-sinx)/(cos^2x)`
`=>int_0^(pi)/2(sec^2x)-int_0^(pi)/2(tanxsecx)`
`=>[tanx]_0^(pi)/2-[secx]_0^(pi)/2`
...
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