$\frac{d}{dx}s=\:arc\:cos\:\frac{t}{2}$
$15=-16+v$
$2x^2\cdot x^2\sqrt{x}$
$\int dk$
$\frac{m}{10}<5$
$\sqrt{\sqrt[5000]{3.1416}}$
$\frac{1}{9^{n+1}}$
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