$-12-3+18:\left(-12:6+8\right)$
$\left(2x+y\right)\left(2x-y\right)\left(4x^2+y^2\right)$
$\frac{d}{dx}\left(2e^{\sin\:\left(\frac{x}{2}\right)}\right)$
$1=x^4+5y^3$
$\left(2a^2-b\right)^3$
$\lim_{x\to-4}\left(\frac{20}{\sqrt{5x+1}-1}\right)$
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