A theorem which states that (cos θ + i sin θ)n = cos nθ + i sin nθ, where i is the square root of −1.
More example sentences
- 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 mathematician, fellow of the Royal Society.
Definition of de Moivre's theorem in:
- The US English dictionary