$4y'\:+\:9y\:=\:15$
$\frac{d}{dx}sin\left(x+y\right)e^y=\sqrt{y}$
$\lim_{x\to\infty}\left(\frac{1+\ln^3\left(x\right)}{x\ln\left(x\right)}\right)$
$\frac{dy}{dx}=y^2\sqrt{4-x}$
$tan\left(2x\right)=\frac{2\cot\left(x\right)}{\csc^2\left(x\right)-2}$
$\left(2-x\right)\left(6-x\right)$
$\frac{-\left(-4+5-6\right)-\left(7-3+6\right)-5}{4\left(-1+3\right)-3}$
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