\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

\(\forall x \in X, \quad \exists y \leq \epsilon\)

\(\alpha , A, \beta, B, \gamma, \Gamma, \pi, \Pi, \phi, \varphi, \mu, \Phi\)

\(\cos (2\theta) = \cos^2 \theta - \sin^2 \theta\)

\(\lim\limits_{x \to \infty} \exp(-x) = 0\)

\(\frac{n!}{k!(n-k)!} = \binom{n}{k}\)

\(\frac{\frac{1}{x}+\frac{1}{y}}{y-z}\)

\(\begin{equation} x = a_0 + \cfrac{1}{a_1 + \cfrac{1}{a_2 + \cfrac{1}{a_3 + \cfrac{1}{a_4} } } } \end{equation}\)