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If D1a n dD2 are two 3xx3 diagonal matri...

If `D_1a n dD_2` are two `3xx3` diagonal matrices, then which of the following is/are true? `D_1a n dD_2` is a diagonal matrix b. `D_1D_2=D_2D_1` c. `D1 2+D2 2` is a diagonal matrix d. none of these

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