Integral de $\frac{x^2}{1+x^4}$ de 0 a $\infty $

Evaluar la integral

$\int_2^{\infty}\left(\frac{1}{x^2+x-2}\right)dx$

Evaluar la integral

$\int_{-\infty}^{\infty}\left(\frac{1}{2x^2\left(x-1\right)}\right)dx$

Calcular la integral

$\int\frac{1}{\left(x^4+1\right)}dx$

Calcular la integral

$\int\frac{dx}{x^2+7x-6}$

Calcular la integral

$\int\frac{dx}{x^2+7x+6}$

Evaluar la integral

$\int_2^{\infty}\left(\frac{1}{x^2+6x+5}\right)dx$

Evaluar la integral

$\int_0^{\infty}\left(\frac{1}{\sqrt{x}+x^2}\right)dx$