Golly, that was easy...
- From: "Edward Green" <spamspamspam3@xxxxxxxxxxx>
- Date: 14 Jan 2007 08:58:54 -0800
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?
.
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