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Question: tools to know data(points)

Question:tools to know data(points)

Noor2015 20 Maple
plot points
September 17 2015
0

 

hi

if I draw the equation (x^2-4=0) . I want to know the data (points) of this plot. i.e , the points which are passing  through a curved.which tools  should I use to know these points?
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