$3y\:-2xy;\:x=2;y=-1$
$31^2-81^2$
$\frac{\sqrt[2]{a}+\sqrt[2]{ab}}{6\sqrt[2]{b}}$
$2x^{-2}$
$\csc\left(\theta\:\right).\cos\left(\theta\:\right)=\cot\left(\theta\:\right)$
$\frac{d}{dx}\:seno$
$\lim_{x\to0}2^{\frac{1}{x}}$
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