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If D(1) and D(2) are two 3xx3 diagonal m...

If `D_(1)` and `D_(2)` are two `3xx3` diagonal matrices, then which of the following is/are true ?

A

`D_(1)D_(2)` is a diagonal matrix

B

`D_(1)D_(2)=D_(2)D_(1)`

C

`D_(1)^(2)+D_(2)^(2)` is a diagonal matrix

D

none of these

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