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5.51.2  Inverse of a matrix: inv /

inv takes as argument a square matrix A.
inv returns the inverse matrix of A.
Input:

inv([[1,2],[3,4]])

or:

1/[[1,2],[3,4]])

or:

A:=[[1,2],[3,4]];1/A

Output:

[[-2,1],[3/2,1/-2]]

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