$x^2+xy+yx+y^2$
$\lim_{x\to0}\left(\frac{z^2}{z^2+z-6}\right)$
$p+q+r-2p-6q+3r+p+5p-8r$
$\frac{d}{dx}\sec\left(\frac{1}{x^3}\right)$
$\left(6\cdot c+5\cdot n\right)^2$
$\int\sec^5\left(u\right)dx$
$\infty^{-0.1}$
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