This is just a toot demonstrating inline math such as \(e^{i\theta} = \cos \theta + i \sin \theta\) and display math, such as
\[f(v) = Av\]
where\[ A = \begin{pmatrix}3 & 0 & 0 \\0 & 2 & 0 \\0 & 0 & \varphi\end{pmatrix} \]
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