$2b-5b$
$\left(\frac{2m}{3}\right)\left(\frac{3n}{1}\right)$
$\lim_{x\to0}\left(\left(\frac{1}{x}-cotx\right)\right)$
$2.23\left(-64.2\right)^2-\frac{2840}{1.68^3}+0.662^5\left(26.3^3-9.49^4\right)$
$9n^2-6n+1$
$x=\:-\:5,\:y\:=\:4$
$\int\frac{x}{\sqrt{5-4x^2}}dx$
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