$\sqrt{x-5}=\:5\:-\sqrt{x}$
$\frac{4.2}{2.8}$
$\lim_{x\to0}\left(\frac{1}{3.5}\right)tangx$
$\lim_{x\to\infty}\left(\frac{1}{-\left(3n\right)^{\frac{1}{n}}}\right)$
$h^2-\frac{1}{9}=-\frac{35}{36}$
$120+85+45$
$2r^2+10r=28$
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