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Soit z = a + j b, que vaut |z| le module de z ?
|z|= b
|z|= arctan (a2 -b2)
|z|= racine de (a/b)
|z|= arctan(b/a)
|z|= arctan (a -b)
|z|= racine de (a+b)
|z|= racine de (a2+b2)
|z|= a
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