1.

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

Answer»

`(1)/(SQRT(2)) tan^(-1) ((X^(2) -1)/(sqrt(2x)) ) + C`
`sqrt(2) SIN^(-1)((x^(2) -1)/(sqrt(2)x)) + c`
`(1)/(sqrt(2)) sinh^(-1) ((x^(2) -1)/(sqrt(2)x) ) + c`
`sqrt(2) cosh^(-1) ((x^(2) -1)/(sqrt(2)x)) + c `

Answer :A


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