23 lines
380 B
TeX
23 lines
380 B
TeX
> Here is a formula:
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$$
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\dfrac{\partial}{\partial t}(
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\dfrac{\partial \mathcal{L}}{\partial \dot{q}_k}
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) - \dfrac{\partial \mathcal{L}}{\partial q_k} = 0
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$$
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> And here is a circuit:
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```tikz
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\usepackage{circuitikz}
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\begin{document}
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\begin{circuitikz} \draw
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(0,0) to[battery] (0,4)
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to[ammeter] (4,4) -- (4,0)
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to[lamp] (0,0)
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;
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\end{circuitikz}
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\end{document}
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```
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