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Am I not inside the domain ?

x=var('x') f = Piecewise([[(0,pi/2),-1],[(pi/2,pi),2]]) plot(f(x),(x,0,pi))

? ValueError: Value not defined outside of domain. ?

Am I not inside the domain ?

x=var('x') f = Piecewise([[(0,pi/2),-1],[(pi/2,pi),2]]) plot(f(x),(x,0,pi))plot(f(x),(x,0,pi))

**?
?
ValueError: Value not defined outside of domain. ?domain.

?**