$5-\left|3-8-7+1+\left(4-3\right)\right|$
$-3x^2+5x+4$
$\lim_{x\to a}\left(\frac{x^2-a^2}{\sqrt{x}-\sqrt{a}}\right)$
$\frac{d}{dx}+2y=x^3e^{-2x}$
$\frac{4\:sin\left(4x\right)}{sin\left(x\right)}=16\:cos\left(x\right)cos\left(2x\right)$
$\frac{10^{20}}{10^{17}}$
$\sqrt{x+20}=\:3$
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