Complex number : - ( proof of De moivre's theorem by Euler's formula ) - 48.

Complex number is a number that can be expressed in the form
of a + bi. where a and b are real numbers, and i is a square root
of -- 1. Complex numbers can be called as imaginary numbers.
De Moivre's theorem :
( Cos x + i Sin x ) power n = Cos (nx ) + i Sin (nx)
Proof of De moivre's theorem by Euler's formula.
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