$\frac{d^{20}}{dx^{20}}\left(2\cos\left(x\right)\cos\left(3x\right)\right)$
$2x+1\cdot x\cdot x+2$
$2a-4b-3\left(a-2b-2\right)$
$\int\sqrt{3+2s}ds$
$\frac{dy}{dx}+\frac{4y}{x}=-3x$
$\frac{10x^3}{2}$
$\left(\sqrt{y}+x\right)\left(2+\sqrt{y}\right)$
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