$\int x\left(2+2x^3\right)dx$
$\frac{x^3-x+6}{x^2+5x+4}$
$4ab^2c-6a^2b+8ab$
$\frac{dy}{dx}\cdot2+y=12$
$\lim_{x\to0}\left(\sec\:^2\left(x\right)\right)$
$1x^2+bx-c$
$\frac{4x^2-20x+25}{4}$
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