$10a^3+5a^4-30a^2$
$\lim_{x\to0}\left(\tan\left(9x\right)\right)^x$
$x^2+40x+25$
$\frac{x}{3}<4$
$\left(2-y\right)\left(4+2y+2y^2\right)$
$\frac{2x^3y^{-2}}{2x^2}$
$4x^2+9y^2\le24x+18y-9$
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