$\left(x-1\right)^2>0$
$-12xy+30x$
$\left(x^3+y^2+z^2\right)^2$
$700a^2+700a^2$
$\frac{dy}{dx}=x+5$
$\left(x-3\right)^2-3\left(x+2\right)^2+2x$
$\lim_{x\to0}\left(\frac{1}{2+te^{-2t}}\right)$
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