[PD] basic DSP stuff

[Frank Barknecht]

Hallo,
Chuckk Hubbard hat gesagt: // Chuckk Hubbard wrote:

> Now I'm seeing something. Ah ha.
> (cos x cos y) = (-cos x * cos y) = -(cos x cos y)
> and
> -(cos x cos y) + (sin x sin y) = -(cos(x+y)) = cos (x+y)
> 
> So the negative is a red herring since cosine is an even function? (I use x
> and y not as polar terms, but because I have no theta key)
> 
> Crazy. I wonder if that's right.

It's not right, because: cos(x) != -cos(x). You probably intended to
use cos(x) == cos(-x), but that's different thing.

Ciao
-- 
 Frank Barknecht                 _ ______footils.org_ __goto10.org__