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

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

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

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

int(x^4+1)/(x(x^2+1)^2)dx=Aln|x|+B/(1+x^2)+C ,

(i) int((x^(2) - 1)/(x^(2) + 1))dx , (ii) int ((x^(6)- 1)/(x^(2) + 1))dx (iii) int ((x^(4))/(1+x^(2)))dx , (iv) int((x^(2))/(1+x^(2)))dx

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

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

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

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