Chap6 : Les nombres complexes (2ème partie) Flashcards

1
Q

exp(i*θ) = ?

A

cos(θ) + i*sin(θ)

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2
Q

Écriture exponentielle d’un nombre complexe z de module r et d’argument θ ?

A

z = rexp(iθ)

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3
Q

Soit 2 nombres complexes
rexp(iθ) * r’exp(iθ’) = ?

A

rr’ * exp(iθ + i*θ’)

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4
Q

[exp(i*θ)]ⁿ = ?

A

exp(inθ) = cos(nθ) + isin(n*θ)

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5
Q

1/exp(i*θ) = ?

A

exp(-i*θ)

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6
Q

exp(iθ)/exp(iθ’) = ?

A

exp(i*(θ-θ’))

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7
Q

cos(θ) = f(exp) ?

A

cos(θ) = [ exp(iθ) + exp(-iθ’) ] / 2

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8
Q

sin(θ) = f(exp) ?

A

sin(θ) = [ exp(iθ) - exp(-iθ) ] /2

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9
Q

z’ = f(z) est …….. de la transformation F

A

l’écriture complexe

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10
Q

Soit un vecteur u-> d’affixe zu->,
L’écriture complexe de la transformation de vecteur u-> est…

A

…z’ = z + zu->

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11
Q

Quelle est l’écriture complexe d’une homothétie de centre A et de rayon k ≠ 0 ?

A

z’ - za = k*(z - za)

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12
Q

Quelle est l’écriture complexe d’une rotation de centre A et d’angle θ ?

A

z’ - za = exp(iθ)(z - za)

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13
Q

Quelle est l’écriture complexe d’une symétrie de centre A (za) ?

A

z’ - za = z - za

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