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Contents of this Calculus 3 episode:
Determinant of 3x3 matrices, Determinant of 4x4 matrices, Expansion rule, Checkboard pattern, expanded along a column, expanded along a row.
Much better than any of my university lectures.
Ingenious to learn any math.
My seventh-grader brother learned to derive, which is quite an evidence that it is explained clearly.
It is the best clear, interpretable, usable learning opportunity for the lowest price.