for all 
then you should take all points from the line 
for which 
- that is the left part of the line and point with x-coordinate -1 must be unfilled, because the sign is <.
for all 
then you should take all points from the line 
for which 
- that is the segment part of the line and points with x-coordinate -1 and 1 must be filled, because the signs are with notion "or equal to".
for all 
then you should take all points from the line 
for which 
- that is the right part of the line and point with x-coordinate 1 must be unfilled, because the sign is >.
Which is the graph of the step function f(x)?
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Answers: 1
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