1.

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

Answer»

`(1)/(2 SQRT(2)) LOG | (x^(2) - sqrt(2)x +1)/(x^(2) + sqrt(2)x +1)| + C`
`(1)/(sqrt(2)) log | (x^(2) - sqrt(2)x +1)/(x^(2) + sqrt(2)x +1)| + c`
`(1)/(2 sqrt(2)) log | (x^(2) + sqrt(2)x +1)/(x^(2) - sqrt(2)x +1)| + c`
`(1)/(2 sqrt(2)) log | (x^(2) - sqrt(2)x -1)/(x^(2) - sqrt(2)x +1)| + c`

Answer :A


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