$\int\frac{x+4}{\left(x^2+1\right)}dx$
$\lim_{x\to-1}\:3x^3-2x^2+5x+7$
$2y^2-2y+1$
$\lim_{x\to4}\left(\frac{4.001^2}{4.001^2+16}\right)$
$\frac{104}{26}$
$-\left(8+4\right)+\left(5-9\right)$
$\int\frac{2x^2-3x+2}{x\left(x^2+1\right)}dx$
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