$x^4-15x^2+10x+24$
$\lim_{x\to0}\left(\frac{e^{-x^2}}{x^2}\right)$
$\frac{dy}{dx}=\sqrt{y}$
$x^2-30x-225$
$5\left(-2y-4\right)$
$\frac{\left(x+2\right)}{x^2-4}+\frac{\left(x-2\right)}{x^2+4}$
$7y^{3\:}+6y^2+3y+9y$
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