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

Evaluate: int ((x^2 -1)dx)/((x^4 + x^2 + 1) is =?

int ((x^2 -1)dx)/((x^4 + 3x^2 + 1) tan^-1((x^2 + 1)/x)) = k logabs(tan^-1((x^2 +1)/x)) + c

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

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

int((x^(2)-1)dx)/((x^(4)+3x^(2)+1)Tan^(-1)((x^(2)+1)/(x)))=

If int((x^(2)-1)dx)/((x^(4)+3x^(2)+1)Tan^(-1)((x^(2)+1)/(x)))=klog|tan^(-1)""(x^(2)+1)/x|+c , then k is equal to

If int((x^(2)-1)dx)/((x^(4)+3x^(2)+1)Tan^(-1)((x^(2)+1)/(x)))=klog|tan^(-1)""(x^(2)+1)/x|+c , then k is equal to

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

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