If int sin^(-1)(2x)/(1+x^(2))dx = f(x) -...

If `int sin^(-1)(2x)/(1+x^(2))dx = f(x) - log(1+x^(2))+c`, then f(x) is equal to

`2x tan^(-1)x`

`-2x tan^(-1)x`

`x tan^(-1)x`

`-x tan^(-1)x`

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