question about symbolic/numerical mixing

• Subject: question about symbolic/numerical mixing
• From: Martin Schönecker
• Date: Thu, 19 Feb 2009 11:02:45 +0100

In your example, seems to be %pi that wants to retain its exact/symbolic 
value.  Maybe setting numer works for you:

(%i1) numer;
(%o1) false
(%i2) tan((2*%pi)/9);
(%o2) tan((2*%pi)/9)
(%i3) numer: true;
(%o3) true
(%i4) tan((2*%pi)/9);
(%o4) 0.83909963117728

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