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).
middleAsColumn: Return all but first and last element as a column vector
Calculate the area of a triangle between three points
04 - Scalar Equations 3
05 - Vector Equations 1
03 - Matrix Variables 1
02 - Vector Variables 4
07 - Common functions and indexing 5
07 - Common functions and indexing 1
02 - Vector Variables 1
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