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intsin^(-1)((2x)/(1+x^2))dxi se q u a lt...

`intsin^(-1)((2x)/(1+x^2))dxi se q u a lto` `xtan^(-1)x-ln|sec(tan^(-1)x)|+c` `xtan^(-1)x+ln|sec(tan^(-1)x)|+c` `xtan^(-1)x-ln|cos(tan^(-1)x)|+c` none of these

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