Hello,
I discover sage and can't plot this second parametric curve :
var("a")
parametric_plot ((cos (a), sin (a)),(a,-5,5)) # is right
parametric_plot ((real (e^(i*a)), imag(e^(i*a))),(a,-5,5)) # doesn't plot
I also test it with the N function... I get the same error.
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