$100x^2-40x$
$\frac{dh}{dt}=-\frac{3}{100}\cdot\sqrt{h-15}$
$4\sec^2-3\:=\:1\:+\:4\tan^2$
$\sqrt{50a^2}b$
$\frac{2}{5}=\frac{1}{5}$
$3+3x^2+4x$
$\frac{y}{2}+7+4+4+7$
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