Let A and B denote n x n invertible matrices. (a) Show that A-1 + B-1 =A-l(A
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(a) Show that A-1 + B-1 =A-l(A + B)B-l.
(b) If A + B is also invertible, show that A-l + B-1 is invertible and find a formula for (A-1 + B-1)-1.
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