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**zahlenspieler****Member**- Registered: 2018-04-12
- Posts: 7

Let *r* be a real number; and *J^2=-1*. Then

and

Thus

In my proof I didn't use any extension of the exponential function to complex numbers; but just some (very rough) estimates for

etc.*Last edited by zahlenspieler (2018-10-02 23:29:24)*

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**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,965

Could you fix your LaTeX? The first two LaTeX codes were not rendered properly.

The integral of hope is reality.

May bobbym have a wonderful time in the pearly gates of heaven.

He will be sorely missed.

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Hi zahlenspieler,

I have fixed your LaTeX.

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

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