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A complex number (x+iy) can always be rewritten in the form r(cos
+isin), in which is the argument. Hence, the argument of a complex number z (arg z) is the (normally positive) angle that OP makes with the positive horizontal axis Ox, in which the point P represents the complex number z in an Argand diagram.The value that lies in a specific interval, such as [0,2
) or (-,+], is called the principal value of arg z.
