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2014-12-14 09:25:05 -0500 asked a question I don't know why Sage return 0 for integrate(sin(2*x).abs(),(x,0,pi)) when its value is 2

When I try integrate(sin(x).abs(),(x,0,pi)) the program return the same thing. The numerical integration is correct, the program return (1.9999999999999998, 2.220446049250313e-14). I don't know if it is a bug or what. Any help? I have tried sage 6.2, 6.3, 6.4.1

Mathematica can do It without any problem http://www.wolframalpha.com/input/?i=...

Neither Sympy nor Maxima can't compute this.