Question: please use concrete examples (a) Show that a nilpotent matrix is not invertible. (b) Let A and B be two orthogonal matrices. Show that (A

please use concrete examples

please use concrete examples (a) Show that a
(a) Show that a nilpotent matrix is not invertible. (b) Let A and B be two orthogonal matrices. Show that (A + B) is not an orthogonal matrix

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