Find A^-1 using Theorem 2.1.2 - Inverse of a Matrix Using Its Adjoint: If A is an invertible matrix,
then A-1 = [1/det(A)] * [adj(A)]
A = 2 0 3
0 3 2
-2 0 -4
Prove that if A is an invertible lower triangular matrix, then A-1 is lower triangular.
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An Invertible Lower Triangular Matrix, Adjoints and Inverses are investigated. The solution is detailed and well presented.