$4x-6x+15-x-4$
$4a^3-2a^6$
$y^2\:+12ya+36a^2$
$\log\left(\frac{u^2}{v}\right)^3$
$\lim_{x\to2.01}\left(\sqrt{\frac{2+x}{2-x}}\right)$
$\int\frac{e^u}{\left(3-e^u\right)^2}du$
$5^0-2^5-\sqrt[3]{1}$
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