`int_(0)^(1)(2x)/((1+x^(4)))dx`

int_(0)^(1)x^2dx

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

If I_(1)=int_(0)^(oo) (dx)/(1+x^(4))dx and I_(2)=underset(0)overset(oo)int x^(2)(dx)/(1+x^(4))"then"n (I_(1))/(I_(2))=

int_(0)^(1) (1)/(1+x+2x^(2))dx

int_(0)^(1) (x)/(1-x)^(3//4)dx=

If I=int_(0)^(1) (dx)/(sqrt(1+x^(4)))dx then

int_(0)^(1) (1)/(x^(2)+x+1)dx

int_(0)^(1) (x)/(sqrt(1 + x^(2))) dx

If I=int_(0)^(1) (dx)/(1+x^(4)) , then

int_(0)^(2) (1)/(4+x+x^(2))dx