$4^a+4^a$
$\lim_{y\to2}\sqrt{4y^2}-2y$
$13+y=0$
$\frac{d}{dx}2e^{-2x}+\frac{1}{3}e^x$
$\frac{5x^3-4x+2}{x^3-x^2}$
$\frac{2ab}{3a\:}$
$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(x\right)-\tan\left(x\right)\right)$
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