$-13n+4n-r$
$27x^3+1$
$18+\left(-7\right)\cdot\left(32-6\right)$
$12ab^2-15a^5b^2+27a^2b^3$
$\lim_{x\to\frac{\pi}{2}}\left(\sec^2\left(x\right)-\tan^2\left(x\right)\right)$
$10^2+6^2$
$\int\frac{\sqrt{x^2-196}}{x}dx$
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