$5-2^2-1^3\cdot3$
$9\:+\:\left(+2\right)$
$\frac{\left(2\infty^2+\infty\right)}{\infty-1}$
$\frac{d}{dx}e^{x^2y^3}+3x-2y^2=7x$
$\left(x+3y-2z\right)^2$
$20.4+1.322+83$
$-\sec^2\left(x\right)+\cos^2\left(1\right)$
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