$\left(2a^3+1\right)^2$
$\lim_{x\to1}\left(x^2-3\right)\left(2x+3\right)$
$3\left(8-2x\right)+2\left(x-19\right)$
$-4x^2+12xy-9y^2$
$\frac{d}{dx}\left(cosh2x\right)$
$\ln\left(\sqrt[8]{\frac{e^7}{x^4+y}}\right)$
$x-3y+4z=-4$
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