$\frac{a}{3}\sqrt{2xy}+\frac{a}{2}\sqrt{2xy}-\frac{a}{4}\sqrt{2xy}$
$\left(\left(\frac{27x^{-5}x^5}{18y^{-6}y^2}\right)^{-1}\right)^2$
$\lim_{x\to0}\left(\frac{1-\cos\left(3x\right)}{1-cos\left(x\right)}\right)$
$x-1^3$
$\lim\:\:_{x\to\:\:0}\:1+x-e^x\sin^2x$
$xy'+kv=f$
$9x^2-12x$
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