$\cos x=\frac{\sqrt{3}}{2}$
$\frac{dy}{dx}+x=3y$
$\lim_{x\to9}\left(\frac{\sqrt{x+3}-\sqrt{3}}{x}\right)$
$y'+20y=24\:\:\:\:$
$\cot^2x=\csc^2x$
$\int\frac{5s^3-s^2+2s+5}{s^2\left(s^2+9\right)}dx$
$\csc\left(x+2\pi\right)$
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