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Update textbook.fr.md

keep-around/aecf04eb08c7b0bb11cf28e01005d88a17a36c2b
Claude Meny 5 years ago
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      00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md

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@ -157,7 +157,8 @@ en el sentido del movimiento.<br>
et dirigé dans le sens du mouvement.<br> et dirigé dans le sens du mouvement.<br>
[EN] with $`\overrightarrow{e_T}`$ the unit vector tangent to the trajectory and [EN] with $`\overrightarrow{e_T}`$ the unit vector tangent to the trajectory and
oriented in the direction of movement.<br> oriented in the direction of movement.<br>
<br>$`\overrightarrow{e_T}=\dfrac{\overrightarrow{l}}{||\overrightarrow{l}||}.
<br>$`\overrightarrow{e_T}=\dfrac{\overrightarrow{dl}}{||\overrightarrow{dl}||}
=\dfrac{\overrightarrow{dr}}{||\overrightarrow{dr}||}`$.
<!--$`\overrightarrow{e_T} <!--$`\overrightarrow{e_T}
=\dfrac{\dfrac{\partial \overrightarrow{OM}}{\partial x}}{\left| \left| =\dfrac{\dfrac{\partial \overrightarrow{OM}}{\partial x}}{\left| \left|

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