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\(\underbrace{cos}_{innecos} \quad \) \underbrace{cos}_{innecos}

\(\stackrel{H}{=} \quad \) \stackrel{H}{=}

\(\mathop{=}_{H} \quad\)\mathop{=}_{H}

\( \xrightarrow{n \to \infty} \quad \) \xrightarrow{n \to \infty} (z \usepackage{mathtools})

\(\sum_{\substack{i > 1 \\ j > i}} \quad \) \sum_{\substack{i > 1 \\ j > i}}

\(\vec{v} \quad \) \vec{v}

\(\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \quad \)
\left[ <backslash>begin{array}{ccc}
1&2&3\\
4&5&6\\
7&8&9
\end{array}\right]

\( \left\{ \begin{array}{l} x+y=0\\x-y=1\\x+z=1 \end{array} \right. \quad\)
\left\{ <backslash>begin{array}{l}
x+y=0\\
x-y=1\\
x+z=1
\end{array} \right.

\(\mathfrak{c} \quad \) \mathfrak{c}

\(\displaystyle\frac{1}{ \displaystyle\sum_{k=1}^{n} x_{k}} \quad\) \displaystyle\frac{1}{ \displaystyle\sum_{k=1}^{n} x_{k}}

\(\sphericalangle \quad \) \sphericalangle

\(\varepsilon \ \varphi \quad \) \varepsilon \ \varphi

\(\displaystyle\frac{\not{4}^2}{\not{6}_3}\ \quad\) \frac{\not{4}^2}{\not{6}_3}

\(\varnothing \quad\) \varnothing