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11-12-2013 - 18:44
$\int \frac{3x^{2}+3x-1}{(x^{2}+x)^{3}}dx$
11-12-2013 - 11:03
$\int_{1 }^{+\infty }\frac{x^{2}-1}{(x^{2}-x+1)(x^{2}+x+1)}dx$
03-12-2013 - 15:24
$\int_{-\infty }^{+\infty }\frac{\left | x \right |}{(1+x^{4})(1+e^{x})}dx$
03-12-2013 - 15:20
$\int_{-\infty }^{-2}\frac{4x^{2}+17x+8}{16x^{2}+40x+25}e^{x}dx$