subexpressions (OT: math)

Peter Otten __peter__ at
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

for a general explanation, and to

for the series given above.


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