Consider the function
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There are several critical points to be listed. List them lexicograhically, that is in ascending order by x-coordinates, and for equal x-coordinates in ascending order by y-coordinates (e.g., (1,1), (2, -1), (2, 3) is a correct order)
The critical point with the smallest x-coordinate is

(

The critical point with the next smallest x-coordinate is

(

The critical point with the next smallest x-coordinate is

(

The critical point with the next smallest x-coordinate is

(

(

Your overall score for this problem is