$\cos\left(30.5\right)$
$x+2y+3z=1$
$\frac{dy}{dx}=\frac{xy}{3}$
$\frac{x^5+x^4+2x+3}{x-1}$
$\left(x+7\right)\cdot\left(x+2\right)+36$
$5d^2-2bc-3d$
$2\pi\cdot11$
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