$\left(n-21\right)\left(n-9\right)$
$\frac{dy}{dx}=\frac{x}{\sqrt{7x+4}}$
$cx^3\left(2x-1\right)\left(2x+5\right)$
$13a+33a^2$
$\lim_{x\to0}\left(\frac{e^2-1}{x}\right)$
$\lim_{x\to\infty}\left(\frac{xe^{2x}}{2}\right)$
$-\left(1+\frac{3a}{n}\right)+1$
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