Geodesic
6 Ways to Derive a Formula of Complex Radical
Matematičeskoe obrazovanie, Tome 37 (2006) no. 2, pp. 2-6.

Voir la notice de l'article provenant de la source Math-Net.Ru

A classical formula of complex radical introduced by Newton is derived in different ways, algebraic, geometric, trigonometric. 
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V. B. Drozdov. 6 Ways to Derive a Formula of Complex Radical. Matematičeskoe obrazovanie, Tome 37 (2006) no. 2, pp. 2-6. http://geodesic.mathdoc.fr/item/MO_2006_37_2_a0/