$-9x^2+y^2-72x-153=0$
$\frac{9-x^2}{x+2}$
$-\frac{2}{3}_+\frac{1}{6}$
$\lim_{x\to0}\left(\frac{tan5x}{tan6x}\right)$
$20+7+20+12$
$3a\:-\:2b\:-\:5b\:+\:9a$
$\lim_{x\to\frac{1}{2}}\left(\sec\left(x\right)-tg\left(x\right)\right)$
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