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Comment peut-on écrire f(t) = A cos(ωt + φ) sous forme exponentielle complexe ?

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Comment peut-on écrire f(t) = A cos(ωt + φ) sous forme exponentielle complexe ?

f(t) = Re{ A e^(−i(ωt + φ))}

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f(t) = Im{ A e^(i(ωt + φ)) }

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f(t) = A e^(i(ωt + φ))

✅

f(t) = Re{ A e^(i(ωt + φ))}

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