$\frac{z^{-4}}{z^{-8}}$
$\lim_{x\to0}\left(\frac{sinx}{xe^x}\right)$
$\left(x^2+hx+k\right)=\left(x-h\right).\left(x-k\right)$
$5x^2-15x=0$
$\frac{x^2+6x}{x+2}$
$\cos\left(\left(90-a\right)-b\right)$
$\frac{d}{dx}y=x^4-2x$
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