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

int_1^4 (x^2-x)dx

int_2^4 (x^2-1)dx

(i) int 1/(1+x^2/4) dx (ii) int 1/((x+2)^2+1) dx (iii) int (dx)/(4+9x^2)

I = int e^(xlog e^a) dx

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

int(dx)/(x.log x)

(i) int_0^1 (dx)/sqrt(1-x^2) (ii) int_0^1 (dx)/sqrt(1+x^2) (iii) a int_1^sqrt3 (dx)/(1+x^2) b int_0^1 (dx)/(1+x^2) (iv) int_0^(2//3) (dx)/(4+9x^2) (v) int_0^1 x/(x^2+1)dx (vi) int_2^3 x/(x^2+1) dx

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

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

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