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// Matematicheskii Sbornik
// Archive
Mat. Sb.,
1867
Volume 2,
Number 1,
Pages
20–25
(Mi sm6928)
Seconde section
Démonstration élémentaire de la formule
$e^{mx\sqrt{-1}}=\cos mx+\sin mx\sqrt{-1}$
A. Davidov
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Steklov Math. Inst. of RAS
, 2024