" 3."int(1)/(1+x-x^(2))dx

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

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

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

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

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

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

If I_(1) = int_(0)^(1) 2^(x^(2))dx, I_(2) = int_(0)^(1) 2^(x^(3))dx , I_(3) = int_(1)^(2) 2^(x^(2))dx, I_(4)=int_(1)^(2) 2^(x^(3))dx then

int x(x^(2)+1)^(3)dx

Evaluate: int3/((1-x)(1+x^2))\ dx