1.

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

Answer»

`x TAN^(-1) ((x^(2)+1)/(x))`
`tan^(-1)((x^(2)-1)/(x))`
`(1)/(sqrt(2)) tan^(-1)((x^(2)+1)/(sqrt(2x)))`
`(1)/(sqrt(2)) tan^(-1)((x^(2)-1)/(sqrt(2x)))`

Answer :B


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