$\lim_{x\to0}\frac{6x^3}{sinx-x}$
$9b^{2\:}-12b+4$
$\lim_{x\to2.1}\left(\frac{x^4-4}{x+2}\right)$
$\frac{5x\left(5x+3x^2\right)+3x\left(x^2+3x\right)}{2x}$
$\sqrt[5]{-32x-7776x-16.807}$
$\left(2x+0.5\right)\left(2x+0.7\right)$
$\left(3x+5\right)\left(2x-9\right)$
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