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$$
é \partial_{\eta} g(\eta(t),\varphi(t));
$$
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\IgnorePar $(I-D) é \varphi(t)$\HCode{\Hnewline <!-- tex4ht_end tex_encodé_utf8_tex4ht_tex math 2 -->\Hnewline \Hnewline}
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$$ é ï î  \int v(t)\, dt = u(t) + C
$$
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