$\frac{dy}{dx}\left(\cos\left(x+y\right)=\sqrt{x+y}\right)$
$4n+11-2n$
$\frac{2}{3}xy\:-\frac{5}{4}xz+\:xz\:+\:\frac{1}{4}xy$
$\int\frac{1}{\sqrt{-x^2+12x-32}}dx$
$\left(2a-10\right)\left(1+2a\right)$
$\:5\left(3x+4\right)$
$100-\left(r-5\right)^2$
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