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Let A = ((0,x,0),(y,0,-x),(0,y,0)) then ...

Let A `= ((0,x,0),(y,0,-x),(0,y,0))` then `A^(3)` equals

A

O

B

`x^(2)I`

C

`(x^(2)+y^(2)) I`

D

none of these

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A
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