$\sqrt{9-x=2}$
$\frac{4.1889}{10}$
$-18\cdot27$
$9x^2+4x+36$
$\left(\frac{x}{2}-2\right)^2$
$4r^2-9$
$\int\left(5x^2+3x+2\right)\left(x+3\right)^3dx$
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