OK, I had var('a,r,n') already.
I added simplify_radical() and got a teachable moment: "why did we get
sqrt(a**2)==abs(a)?
Then we added assume(a>0) and all was well with the world!
Thanx,
A. Jorge Garcia
http://shadowfaxrant.blogspot.com
http://www.youtube.com/calcpage2009
Teacher & Professor
Applied Mathematics, Physics & Computer Science
Baldwin Senior High School & Nassau Community College
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