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#1 2018-10-02 09:24:54
- zahlenspieler
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- Registered: 2018-04-12
- Posts: 7
Sine and cosine
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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#2 2018-10-02 22:43:52
- Mathegocart
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- Registered: 2012-04-29
- Posts: 2,226
Re: Sine and cosine
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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