1.

Integration by partial fraction : int(x^(2)+1)/(x^(4)+1)dx=.....

Answer»

`(1)/(SQRT(2))tan^(-1)((x^(2)-1)/(2X))+c`
`(1)/(sqrt(2))tan^(-1)((x^(2)-1)/(sqrt(2x)))+c`
`(1)/(sqrt(2))tan^(-1)((x^(2)-1)/(2sqrt(x)))+c`
`(1)/(sqrt(2))tan^(-1)((x^(2)-1)/(sqrt(2)x))+c`

Answer :D


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