chanhhoang1328

$\int \frac{3x^{2}+3x-1}{(x^{2}+x)^{3}}dx$

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

$\int_{-\infty }^{+\infty }\frac{\left | x \right |}{(1+x^{4})(1+e^{x})}dx$

$\int_{-\infty }^{-2}\frac{4x^{2}+17x+8}{16x^{2}+40x+25}e^{x}dx$