[Maxima] challenge for trigsimp

Richard Fateman fateman at cs.berkeley.edu
Mon Sep 28 19:06:24 CDT 2009

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cos(y+2*x)+2*sin(x)*sin(y+x)-cos(y)

trigsimp(%)   ;; no change

trigreduce(%)  ;; changed

ratsimp(%)     ;; produces zero.

poissimp  produces zero right away.

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