$5x-18x+9x+4$
$-2x-4y$
$\int\:4xcosx\:dx$
$\int\left(\frac{5x^2-3x^2+2}{2x^2}\right)dx$
$4\sqrt{12\cdot3}$
$\frac{3}{4}\:=\:\frac{1}{4}\:$
$\left(2x^2-2x+6\right)\left(3x^2-5x-9\right)$
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