$13\sqrt{x}-\sqrt{100x}$
$y'+xy=xy^{-2}$
$\cos^2var\phi\:-sin^2var\phi\:$
$\sqrt{2x}-3$
$\int\frac{\left(x\right)}{\left(-8x^2+9\right)}dx$
$\left(12-xy\right)^2$
$\lim_{x\to0}\left(\frac{e^x+x-1}{e^x-1}\right)$
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