$-3x^2-\:3x^2-3x^2$
$\left(x-5\right)^2<9$
$\frac{x^3-9x}{x^3-6x^2+9x}$
$x^2-x-40=0$
$\left[x\cos^2\left(\frac{y}{x}\right)-y\right]dx+xdy=0$
$\sqrt[2]{18}$
$\left(w-8\right)\left(w+8\right)$
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