$\left(6x+12\right)\left(6x-18\right)$
$sin2\left(x\right)=2sin\left(x\right)cos\left(x\right)$
$\frac{18x^2+10x}{2x^4}$
$\sqrt[3]{81b^7}$
$\lim_{x\to0}7x^2-8x+9$
$\int\frac{x^2+5x+6}{\left(x-2\right)\left(x^2-7x+12\right)}dx$
$\left(-l-9\right)^3$
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