Definition of de Moivre's theorem in English:

de Moivre's theorem

proper noun

  • A theorem that states that (cos θ + i sin θ)n = cos nθ + i sin nθ, where i is the square root of 1.

    • ‘The de Moivre's theorem is used very often in electrical engineering and physics to determine things like the phase shifts of alternating currents.’


Early 18th century: named after Abraham de Moivre (1667–1754) French-born English mathematician, fellow of the Royal Society.


de Moivre's theorem

/də ˈmwävrəz ˌTHirəm/