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

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

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

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

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

Evaluate int(dx)/(x^(4)(x^(3)+1)^(2))

int_2^4(dx)/(x(x^2+1))=?

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

If int (dx)/((x^2+4)(x^2+9))=Atan^(-1)((x)/(2))+Btan^(-1)((x)/(3))+c , then A-B =

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

If int (dx)/(x ^(4) (1+x^(2)))=a ln |(1+x ^(3))/(x ^(3))| +(b)/(x ^(3)) +(c)/(1+ x^(2)) +d. then (where d is arbitrary constant)