$\frac{dx}{dt}=\frac{7xlnx}{t}$
$\left(xy+xz\right)^3$
$49m^6-64n^2$
$-1\:-2744$
$\frac{9x^{-3}-81x}{x^2+3x}$
$16^{3\left(x-2\right)}=1$
$\lim\:_{x\to\:0}\left(\frac{x^3-x^2}{cosx-1}\right)$
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