$\lim_{x\to0}\frac{\left(\sqrt{16-x^2}-4\right)}{x}$
$\left(7m^2-3n^4\right)^2$
$100+40m+4m^2$
$an\:+\:ab\:-\:ac\:+\:ax$
$\frac{2^9}{\:5}x\frac{3^9}{7}$
$\sqrt{4^{24}}$
$7x+6\le3x-8$
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