$-3\cdot2x^2$
$\left(3x+7\right)\left(3x+19\right)$
$48x^2-120x+75$
$\lim_{x\to0}\left(\sqrt{x}\left(\frac{1}{\sqrt{x}}\right)\right)$
$32x^2+2xy+18y$
$\frac{3^2\:-\:x^2}{3+x}$
$y ^ { \prime } \cdot 3 y - 28 y = y$
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