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e is a number equalling approximately 2.71828 and is the base for natural logarithms.

It is special because the derivative of ex is the same as itself.

e has many useful properties; the best known which is Euler's equation and which brings together e, i (the imaginary square root of -1) and the trigonometric functions:

eix = cos(x) + isin(x)

When x = π, this gives: eiπ = -1

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15y ago

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