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answered 2014-11-14 23:01:37 +0100
sage: a = (sqrt(2) - 1)*(sqrt(2)+1) sage: a.simplify_full()
1
updated 2014-11-14 23:03:13 +0100
sage: a = (sqrt(2) - 1)*(sqrt(2)+1) sage: a.simplify_full() a.simplify_full() 1