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From: Golabi Doon on 12 Aug 2010 12:05
Hello,

Consider the function f(x) represented in phase/magnitude form sum_k
(z_k)cos(k(x+p_k)) where z_k are negative real and p_k are real.

Some operations on f have nice form, for example, we know sum_k (-k)
(z_k)sin(k(x+p_k)) is the same df/dx. My question is, does sum_k (k)
(z_k)cos(k(x+p_k)) have any meaning in terms of f ? This form is the
same as f(x) except each term of the sum is multipled by "k".

Regards

Golabi
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