$7-\left(-4\right)-\left(-2\right)$
$\left|6-\left(-1\right)\right|$
$2x+3\le x+8$
$6m^2n-mn^2$
$\frac{d^x}{dx^x}\left(x\right)$
$\sqrt{9-3\cos^2}$
$\int\frac{x^2-2x^2+3x-5}{x^2+2x+4}dx$
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