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M3P2
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9673e4cf
Commit
9673e4cf
authored
Feb 01, 2025
by
Claude Meny
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Update cheatsheet.fr.md
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12.temporary_ins/71.waves/30.n3/20.harmonic-progressive-waves/20.overview/cheatsheet.fr.md
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@@ -42,13 +42,17 @@ lessons:
---------------------------
### **
Ondes progressives harmonique
**<br>*en notation complexe*
### **
Les ondes progressives harmoniques
**<br>*en notation complexe*
##### Comment représenter une OPPH en notation complexe ?
*
On utilise le fait que la fonction exponentielle se décompose de la façon suivante :
<br>
$
`\forall \alpha \in \mathbb{R}\;,\,`
$
**$`\large{exp{\,\alpha} = cos \,\alpha + i\cdot sin \,\alpha}\quad`$**
, avec
*$`\large{\;i^{\,2}=-1}`$*
.
<!--$`\forall \alpha \in \mathbb{R}\;,\,`-->
**$`\boldsymbol{\large{exp{\,\alpha} = cos \,\alpha + i\cdot sin \,\alpha}}\quad`$**
,
<br>
avec
*$`\large{\;i^{\,2}=-1}`$*
.
*
Ainsi l'
**onde sinusoïdale plane progressive**
peut s'écrire :
<br>
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