Nombres Complexes Flashcards

1
Q

Démo ; Pour tt (z,z’) € C, pour tt ¥ € R
Re(¥z+z’) = ¥Re(z) + Re(z’)
Im(¥z+z’) = ¥Im(z) + Im(z’)

A

Calculer ¥z+z’ (développer z et z’ en parties Réelles et Imaginaires)
Ordonner et montrer € R
Par unicité de la décomposition d’un complexe en partie réelle et imaginaire : (Résultat)

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2
Q

Re(iz) = ?
Im(iz) = ?

A

= -Im(z)
= Re(z)

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3
Q

z\ = ?
z + z\ = ?
z - z\ = ?

A

= z
=2Re(z)
=2Im(z)i

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4
Q

|z| = ? (2 réponses)

A

= a + ib
= sqrt{zz}

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5
Q

Pour tout téta € R
|e^itéta|=

A

= 1, donc e^itéta € U

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6
Q

(Cos(téta) + isin(téta))(cos& + isin&) = ?

A

= cos(téta + &) + isin(téta + &)

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