Show that if A is both diagonalizable and invertible, then so is A inverse.
Solved (2) Invertibility vs. Diagonalizablilty In each of | Chegg.com
Is an inverse of a non singular diagonalisable matrix, diagonalisable? A is non singular and diagonalisable, will A inverse also be diagonalisable - Quora
Give examples of 1) invertible diagonalizable matrix 2) non invertible diagonalizable