$\frac{x^2-2x-8}{\left(x-2\right)\left(x+2\right)}$
$\lim_{x\to0}\left(\frac{\sin^2x}{\tan\left(x^2\right)}\right)$
$3x^2-15$
$\sqrt[5]{-1x-32x-100000}$
$10-20+300-40+50-60$
$\left(x^2y\right)\:+\:\left(xy^2\right)^2$
$4x^3-6x=0$
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