$x^2-20x-121$
$78=2v$
$\lim_{x\to1}\left(\frac{x^{18}-1}{x^3-1}\right)$
$\left(\frac{4}{9}x^6+\frac{1}{25}y^7\right)\left(\frac{4}{9}x^6+\frac{1}{25}y^7\right)$
$x^2-2ax+a^2$
$cos^2x=0,\:5$
$\left(-4n+2m^3\right)^3$
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