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Answer to Question #38450 in Matrix | Tensor Analysis for Sujata Roy

Question #38450
Let N=[3 -4 0
4 3 0
0 0 1]

If M is any 3*3 real matrix, then trace(NMN^T) is equal to
a) trace(M)
b) 2 trace(N) + trace(M)
c) trace(N)^2 . trace(M)
d) trace(N)^2 + trace(M)
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