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Question: How to detect changes in gradient of a graph

Question:How to detect changes in gradient of a graph

maple_help123 15 Maple
slope plotting
October 25 2020
3

 

Hi, I have this graph and i am trying to find a method that will only look at the second gradient change. I want it to adjust list A that it takes out the coordinates for the first gradient and the last 2. I have tried to find a way to make it work but i have no idea how to get maple to sense that there is a gradient change (basically i want to split the graph in 4 bits each of which contains a constant gradient if that makes sense!)
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