Question: I need help with this: Question 2 Let D, E, F be invertible matrices of the same size. Suppose that D is symmetric, i.e. DT
I need help with this:

Question 2 Let D, E, F be invertible matrices of the same size. Suppose that D is symmetric, i.e. DT = D ; point E is skew-symmetric, i.e. ET = -E; and F is orthogonal, i.e. FT = F-1 (DE-1FT)-1(ED)TF = O -FED FDE O -FE2F O -DEF-'EDF O -EF'E O -E2F2
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