$\frac{2}{1-\tan^2\left(60\right)}$
$-84ab-16ab$
$2\frac{dy}{dx}=-19.62-\frac{y}{20}$
$2\left(3\right)-2-4$
$9xy+y+x-5+3yx$
$\lim_{x\to\infty}\left(\frac{1}{\sqrt{1+\sqrt{\frac{1}{\sqrt{x}}}}}\right)$
$\left(-1\right)\left(2x^3\right)$
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