$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(x\right)-\frac{1}{2}}{x-\frac{\pi}{3}}\right)$
$-2x^2-6x+11$
$3ydx+4xdy=0$
$2x+y=2$
$\frac{2z^2-8}{x^2+4x+4}$
$-\left|-8\right|+\left|3-10\right|$
$12.405\:-\:8.75$
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