One of the mysteries of the English language finally explained.
In the genitive: denoting any of a number of concepts or theorems attributed to or associated with de Moivre; specifically denoting the identity (cos θ + i sin θ)n = cos nθ + i sin nθ, where n is a whole number and i is the square root of −1; chiefly in "de Moivre's formula", "de Moivre's theorem".
Late 18th century; earliest use found in The Monthly Magazine and British Register. From the name of Abraham de Moivre, French-born British mathematician.
de Moivre/də ˈmwɑːvrə/
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