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Write the value of int(cosx-sinx)/(sinx+...

Write the value of `int(cosx-sinx)/(sinx+cosx)dx`.

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`int(cosx-sinx)/(sinx+cosx)dx=int(dt)/t` where sin x+cos x=t `rArr(cosx-sinx)`dx=dt=In | t| +C=In |sin x+cos x|+C
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