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$-3x^{-4}$
$\frac{dy}{dx}\left(\frac{x-8}{2x+1}\right)^4$
$\sqrt{2+7}$
$\lim_{x\to-\infty}\sqrt{x^2+1}$
$9\left(s+5t\right)$
$\int\left(x^2-2x+1\right)^{3\:}dx$
$\lim_{x\to\infty}\left(1+\frac{2}{x^4}\right)^x$
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