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bug#4031: calc simplification problem

From: Colin Williams
Subject: bug#4031: calc simplification problem
Date: Tue, 4 Aug 2009 10:28:58 -0400 
In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
"cos(x)^2 sec(x)", which contradicts an example in the tutorial on
rewrite rules.

Colin
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