$5x^2+10x-1$
$-x^2-12x+9$
$88\cdot74$
$\int\frac{1}{2}sen\left(x^2\right)dx$
$\frac{d}{dx}4x^2+9y=36$
$5\cdot14$
$\left(\frac{5a}{4b}\right)^{-2}$
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