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A skew symmetric matrix S satisfties the...

A skew symmetric matrix S satisfties the relation `S^(2) + I= 0`, where I is a unit matrix, then `CAC^(-1)` then `CA^(3) C^(-1)`. Is equal to

A

I

B

2I

C

`-I`

D

`-2I`

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The correct Answer is:
A
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