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Definition of Function

What is e in ...

Question

What is $e$ in complex numbers?

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Solution

$e$ in complex numbers
In complex numbers, $e$ represents Euler’s number.
It is used to express the Euler's formula such as,
$e^{i x} = \cos x + i \sin x$
$e^{- i x} = \cos x - i \sin x$

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