$\frac{4}{\sqrt{16-x^2}}$
$\frac{2x^3+x}{x+3}$
$3x^2-5x-4=0$
$\lim_{x\to\infty}\left(\frac{\sqrt{10x^4+20}}{22x^2+24}\right)$
$x^2+8x+18=0$
$\frac{225\pi}{5}$
$\frac{\frac{d}{dx}\:\:\:\:\:\tan x}{\:\:\:\:\:\:ln\:x}$
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