subexpressions (OT: math)
Peter Otten
__peter__ at web.de
Mon Jun 4 12:57:27 CEST 2007
Wildemar Wildenburger wrote:
> Peter Otten wrote:
>> With y = x^2 = 1/3 pi^2 - 4(cos x - cos(2x)/2^2 + cos(3x)/3^2 - ...)
>>
>> area is dimensionless, too, I suppose.
>>
>
> Ehr, ... maybe this is obvious, but I don't see it: Please explain the
> second equality sign.
I know not much more about Fourier series than that they do exist, so let me
refer you to
http://en.wikipedia.org/wiki/Fourier_series
for a general explanation, and to
http://www.exampleproblems.com/wiki/index.php/FS6
for the series given above.
Peter
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