$6\:+\:12\:\cdot\:2\:-\:8$
$\int\frac{16}{4-x^2}dx$
$\left(4m+5n+c\right)^2$
$4x-4x^2$
$\lim_{x\to0}\left(\frac{\sqrt{7-x}-\sqrt{7+x}}{x}\right)$
$27m^6-\frac{8^2}{y^9}$
$x^4-2^2$
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