$\frac{x^3+2x^2+4x+2}{x^2}$
$\frac{d}{dx}\left(9x^{\sqrt{x}}\right)$
$4x^{-1}\:cosx$
$6x-10x+8x-18x+4x$
$\left(2a-b+3c\right)-\left(21-b-3c\right)$
$x^2-3x-8$
$\int x\cdot\left(3x+3\right)dx$
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