Use a graphing calculator for Exercise.
Graph y = x4 − 2x3 + 2x in a window with −3 ≤ x ≤ 3. Is the “flat” part of the graph near x = 1 really a horizontal line segment? (Hint: Use the trace feature to move along the “flat” part and watch the y-coordinates. Do they remain the same [as they should on a horizontal segment]?)
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