$\lim_{x\to0}\:\left(e^{-x}-1-\frac{x^2}{2}\right)$
$m\left(x+y\right)^2+n\left(-x-y\right)$
$4=\log_{b}\left(16\right)$
$12.4+8.3+5.22$
$\frac{d^4}{dx^4}\left(\frac{1}{2-x}\right)$
$ay\:dx+\:bx\:dy=0$
$4\cos\left(2x\right)-1=1$
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