$\lim_{x\to1}\left(\frac{x^2-4x-3}{x^2-1}\right)$
$\left(-2x^{3}+5x-6\right)\cdot\left(x^{2}-2x\right)$
$\int x\left(3x+2\right)^7dx$
$\left(-8\right)^{20}\::\:\left(-8\right)^{18}$
$\frac{c^4}{c^7}$
$\int_0^1\left(\frac{x^3}{\sqrt[2]{4+x^2}}\right)dx$
$10x-2x+8+12x$
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