$\frac{4x^6-3x^4+x^2+5}{x-1}$
$\lim_{x\to0}\left(\frac{\sqrt{x-a}-\sqrt{a}}{x}\right)$
$6\sin\left(x\right)^2+7\sin\left(x\right)+2$
$\left(-2\right)\cdot\left(-5-\left(-2\right)\right)$
$\left(9k+12m\right)^2$
$x^4-9y^2$
$24x+15y=300$
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