If int(e^(x))(1-sinx)/(1-cosx)dx=f(x) co...

If `int(e^(x))(1-sinx)/(1-cosx)dx=f(x)` constant, then f(x) is equal to

`e^(x)cot(x/2) +c`

`e^(-x)cot(x/2)+c`

`-e^(x)cot(x/2)+c`

`-e^(x) cot(x/2)+c`

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