Make fMat be a 5x3 matrix of random integers with values from -3 to 3
(Hint: use randi)
Test for randomness could be tightened (cf. Solution 1490988).
Most nonzero elements in row
Return a list sorted by number of occurrences
Derivative of polynomial
Sum of the Matrix Elements
02 - Vector Variables 2
03 - Matrix Variables 5
05 - Vector Equations 2
06 - Matrix Equations 2
02 - Vector Variables 3
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