$r\:=cos20^{\circ}\:+\:cos100^{\circ}\:+\:cos140^{\circ}$
$\int\:\:5x^{-6}dx$
$\frac{2x^4-2x^3-4x^2+7}{x+2}$
$\lim_{x\to3}\left|\frac{36-5x}{10}\right|\left|\frac{36+5x}{10}\right|$
$4x^2-324$
$11+2x+x+4$
$\frac{\sec^2\left(\frac{x}{2}\right)}{2\tan\left(\frac{x}{2}\right)}$
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