(iii) solve `int(x^(2))/(1+x^(2))dx`

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

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

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

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

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

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

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

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

Solve int(x^(3))/(x+1)dx

(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