If int(sinx)/(cosx(1+cosx))dx = f(x)+c, ...

If `int(sinx)/(cosx(1+cosx))dx = f(x)`+c, then f(x) is equal to

`|(1-cosx)/(cosx)|`

`log|(cosx)/(1+cosx)|`

`|(sinx)/(1+sinx)|`

`log|(1+sinx)/(sinx)|`

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