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[Axiom-math] expand (cos (2*x))


From: Francois Maltey
Subject: [Axiom-math] expand (cos (2*x))
Date: Tue, 31 May 2005 18:36:07 +0200
User-agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.5 (chestnut, linux)

Hello, 

expand (cos (x+y)) is right.
but how can I do expand (cos (2*x)) in cos(x)^2 - sin(x)^2 by example.

And how can I get the source file of this expand ?

Thanks a lot.

Fran├žois




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