Subject: RE : simplify using trigonometric identities
From: laurent couraud
Date: Fri, 1 Feb 2013 00:30:09 +0100
Hi,
It seems to work with trigreduce.
Best.
> -----Message d'origine-----
> De?: maxima-bounces at math.utexas.edu [mailto:maxima-bounces at math.utexas.edu] De la part de
> Nijso Beishuizen
> Envoy??: jeudi 31 janvier 2013 23:57
> ??: maxima at math.utexas.edu
> Objet?: [Maxima] simplify using trigonometric identities
>
> I have a horrible expression:
>
> phi:
> ((c-1)*cos(x)*sin((c+1)*x)+(1-c)*sin(x)*cos((c+1)*x)
> + (-c-1)*cos(x)*sin((c-1)*x)
> +(-c-1)*sin(x)*cos((c-1)*x)) /(2*c^2-2);
>
> which can be simplified to -sin(c*x)/(c^2-1)
>
> I simplified it by hand using a number of sin(a+b)=sin(a)cos(b)+sin(b)cos(a)
> and cos(a+b) rules using subst(). But can it be simplified in an automatic way
> without visual inspection?
>
> Best,
> Nijso
>
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