$16a^2-81b^4$
$\lim_{x\to\infty}\left(\frac{16x}{\csc\left(\frac{4}{x}\right)}\right)$
$\sqrt{\sqrt{8^{23}.5^{32}}}$
$m-\left\{m-\left[m-\left(m-1\right)\right]\right\}$
$m^2-8m+16$
$5x-6-3x+16$
$\left(2x^3\:y+4z\right)\left(-4z+2x^3\:\right)$
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