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If D1 and D2 are diagonal matices of ord...

If `D_1 and D_2` are diagonal matices of order `3xx3` then (A) `D_1^n` is a diagonal matrix (B) `D_1D_2=D_2D_1` (C) `D_1^2+D_2^2` is diagonal matrix (D) `D_1D_2` is a diagonal matix

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