Additional test cases have been added.
This problem needs more tests. For instance, x = [1 10 3 0 2 4 0 8 -9 1] is a case with a non-positive difference, but a maximum change, which would make many solutions fail.
Angle between two vectors
Sort numbers by outside digits
Fill a zeros matrix
07 - Common functions and indexing 1
Area of an equilateral triangle
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