$\left(m+n\right)\left(m^3+n^3\right)$
$\left(\:x\:+\:4\:\right)\left(\:x\:-\:4\:\right)$
$-4-7-3-4-5-8$
$\lim\:_{x\to\:\:2}\left(\frac{5x^2-8x-13}{x^2-5}\right)$
$\lim_{x\to-1}\left(6x^2+5x+1\right)$
$7x^3-7x$
$4\cos^2\left(a\right)-1=0$
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