Re: Extract coefficients of a trig polynomial
- To: mathgroup at smc.vnet.net
- Subject: [mg126146] Re: Extract coefficients of a trig polynomial
- From: Yi Wang <tririverwangyi at gmail.com>
- Date: Fri, 20 Apr 2012 07:49:48 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <jmoge7$46g$1@smc.vnet.net>
Hi, Sam,
The following may help. But it may be not as general as you want.
Coefficient[expr, #] & /@ {Cos[2 \[Theta]], Cos[4 \[Theta]],
Cos[6 \[Theta]]}