Evaluate the following integrals: `intcos^(-1)((1-x^(2))/(1+x^(2)))dx`

1.	Evaluate the following integrals: `intcos^(-1)((1-x^(2))/(1+x^(2)))dx`
Answer» Correct Answer - `2xtan^(-1)x-log(1+x^(2))+C` Put `x=tant anddx=sec^(2)t" dt. Use"((1-tan^(2)t)/(1+tan^(2)t))=cos2t`.

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