$36-x^2$
$2^3.2^32^3.2^3$
$\lim_{x\to\infty}\left(3^{x+1}\right)$
$\left(5m+n\right)^3$
$\csc^2\left(a\right)-\frac{1}{\tan^2\left(a\right)}$
$4^2\:x\:-8$
$2a^2+6a-a^2-a^2$
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