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I generally find that mathematicians always have a preferred way of writing an expression, whether be it because to them it's more aesthetic pleasing or easier to memorize. Few expressions, however, lend themselves to many forms as thus Euler's famous equation: [tex]e^{ix} = cos(x) + isin(x)[/tex].

I've seen it written with pi, infinite series, limits, derivatives, etc.

Here is my personal favorite

[tex]\sqrt{e^{-\pi}} = i^i[/tex]

You turn. =)

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# What your favorite variation of : Euler's Formula

**Physics Forums | Science Articles, Homework Help, Discussion**