challenge for trigsimp

• Subject: challenge for trigsimp
• From: Richard Fateman
• Date: Mon, 28 Sep 2009 17:06:24 -0700

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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