$\lim_{x\to5}\left(\frac{x^2-3x+10}{x^2-25}\right)$
$\left(7x\cdot3y\right)^4$
$\left(4a\:+\:6b\:-\:8z\right)\:\left(4a\:-\:6b\:+\:8z\right)$
$\int\frac{x^2}{\sqrt{x+1}}\:dx$
$\lim_{x\to\infty}\left(\frac{1}{\left|x\right|}\right)^x$
$21\:.\:1\:.\:-1\:.-3$
$-7+3-1+2$
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