1.

int (1)/((x^(2) + 1)(x^(2)+ 4))dx =

Answer»

`(1)/(3) [ TAN^(-1) X - (1)/(2) tan^(-1)""(x)/(2)] + c`
`(1)/(3) [ tan^(-1) x + (1)/(2) tan^(-1)""(x)/(2)] + c`
`(1)/(3) [tan^(-1) x - (x)/(2) + 2 tan^(-1) x] + c`
`(2)/(3) [ tan^(-1) x - (3)/(2) tan^(-1)""(x)/(2)] + c`

Answer :A


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