$\frac{3x^3-x^2+x+4}{x-3}$
$\frac{2}{\frac{x}{2}+1}+\frac{x}{2}+1$
$81x^2-\left(a-3x\right)^2$
$-55\cdot100$
$8\left(-2\right)\left(-1\right)$
$\int-2\cos^2\left(3x\right)dx$
$\lim_{x\to-3}\:x^2-x-1$
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