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$\frac{a}{b} + \frac{1}{1 + \frac{b}{a}}$

$x = a_1^2 + a_2^2 + a_3^2 + \ldots + a_n^2$ $\frac{a}{b} + \frac{1}{1 + \frac{b}{a}}$ $\dfrac{a}{b} + \dfrac{1}{1+\dfrac{b}{a}}$ $\left(\dfrac{x^\frac{2}{5}}{y^\frac{3}{2}}\right)^{-2}\cdot \dfrac{(y^{-1}x^{-2})^{-\frac{1}{2}}}{(xy^2)^\frac{1}{10}}$ $s_x=\sqrt{{\frac{1}{n}} \big [(x_1-\overline{x})^2 + (x_2-\overline{x})^2 +\ldots + (x_n-\overline{x})^2 \big ]}$ $\sqrt{v+5}-\sqrt{v^2-7}=0$ $\sqrt[3]{v+5}-\sqrt[2]{v^2-7}=0$ $\dfrac{\tg{(-\frac{\pi}{4})} \cdot{\cotg{(-\frac{\pi}{4})}}} {\sin{(-\frac{3}{2}\pi)} \cdot \cos{(-4\pi)}}$ $x \in A, A \subset B \subseteq C \supset D \supseteq D \ni y$ $\mathcal{ABCD}$ $\alpha + \beta + \gamma + \delta +\psi + \eta + \pi + \sigma + \rho = \Omega + \Delta + \Pi$

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