$-24x^3+9x^6+16\ge\:0$
$2x^2-x-15$
$9x^2-42x\:+21$
$-\frac{2}{3}x\:+\:9\le\frac{5}{6}x-\frac{1}{2}$
$\sqrt[2]{-9}$
$\int x\sqrt{4x^2+9}dx$
$3mn^2\left(-5m+4n\right)$
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