$x^2+2x-18$
$\lim_{x\to1}\frac{5\:sin\left(3\pi x\right)}{cos\left(\pi x\right)+x}$
$\frac{d^2}{dx^2}\left(-4\sec\left(x\right)\right)$
$2x+20=100$
$-\frac{5}{6}-\frac{1}{6}$
$\sin^2\left(x\right)-cos^2\left(a\right)$
$\int\frac{\sqrt{10-\:x^2}}{x}dx$
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