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Integrate the following int(sinx)/(cos^3...

Integrate the following `int(sinx)/(cos^3x)dx`

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`int(sinx)/(cos^3x) dx`
[put cosx=t then sinx dx=-dt]
`int((-dt)/t^3)=-int-t^3 dt`
`-t^(-2)/-2+C=(1/2t^2)+C.
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