diagonal matrix - prove

if D = diag(a1 , a2 , a3 , ...... an), where ai ≠0 for all i = 1,2....,n, then show that

D-1 = diag(a1-1 , a2-1 , a3-1 , .......... an-1).

1 Answers

36
rahul ·

one more
2) Let matrix ∂ =
[cosA sinA]
[-sinA cosA],

where A = pi/5

Then B = A4 - A3 + A2 - A is

(A)Singular (B)non-singular
(C)symmetric (D)|B| = 1

note : Its a multi-choice multi correct question

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