$\int xcos\left(2x+2\right)dx$
$\frac{12x^715x^6+24x+3}{3x}$
$-3456\cdot396$
$x^2-m^4-2m^2n-n^2$
$15b^2-31b-24$
$\frac{20x^3-23x^2+31x^1-15}{5x^1-2}$
$\lim_{x\to-\infty}\left(\frac{x+7}{\sqrt{x^2-3}}\right)$
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