Re: Golly, that was easy...
- From: "Dirk Van de moortel" <dirkvandemoortel@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 14 Jan 2007 17:28:24 GMT
"Edward Green" <spamspamspam3@xxxxxxxxxxx> wrote in message news:1168793934.146865.155450@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I recall straining my mind over diagrams full of angles and
perpendiculars, deriving (once) or trying to recover (many times) the
addition formulas for cosine and sine. I'm not sure when I first
discovered they were both contained, without any effort at all, in the
statement exp[i(a+b)] = exp[ia]exp[ib].
What makes the exponential function so unreasonably useful?
The fact that it is equal to its derivative?
Dirk Vdm
.
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- Golly, that was easy...
- From: Edward Green
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