de Moivre's theorem
/də ˈmwɑːvr(ə)
/noun Mathematics
A theorem which 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.
Origin
Early 18th century: named after Abraham de Moivre (1667–1754), French-born mathematician, fellow of the Royal Society.
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