$\frac{dx}{dt}=\frac{1}{2}x-\frac{5}{12}x^2$
$\lim_{x\to4}\left(\frac{\sqrt{x-4}}{\sqrt{x-2}}\right)$
$2\cdot\tan\left(b\right)\cdot\cos\left(b\right)^2\:+1$
$\lim_{x\to-2}\left(w+2\right)\left(w^2-w-6\right)$
$\left(x^2+x+1\right)\left(x^2+x+1\right)\left(x^4-x^2+1\right)$
$\left|19\cdot\left(-2\right)\right|\cdot16$
$-3\le\frac{-3}{6}\le\frac{-1}{2}$
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