$15\cdot16$
$-\left(x-6\right)^2$
$\frac{d}{dx}4e^{5-2x}$
$5x^3+40y^3$
$1x^2-1x-6$
$\left(x-3\right)\left(x+8\right)+\left(x-7\right)\left(x+6\right)$
$\sqrt{144}xy-z$
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