$9a^2-30a$
$\cos\left(x\right)-\sin\left(x\right)=\cos\left(x\right)\cot\left(x\right)$
$x\:\frac{dy}{dx}+y=e^x$
$\left(2x-1\right)\left(2x+5\right)$
$\lim_{x\to0}\left(\frac{5-\sqrt{3x+28}}{x+1}\right)$
$5\:x\:>\:25$
$\left(5s+2w\right)^2$
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