Hello everyone. 

Was wondering how can I get an image of function if I have an interval for 
it (problem comes if I have unioned intervals. I dont know how can I call 
each interval start/end or at least split union into Nth intervals). SymPy 
docs gives info about transform. but I've browsed source code and it's not 
even loaded as well as out of source files. So, it's taken away?

Example of what I want (basically, it can be any function, keyboard input):

f : R -> R
f(x) = x**3 - 3*x, x in R

f([0, sqrt(3)] = [-2, 0]

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