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If A=[(cos alpha,sin alpha),(-sin alpha,...

If `A=[(cos alpha,sin alpha),(-sin alpha,cos alpha)]` and A. adj `A=[(k,0),(0,k)]` , then k is equal to

A

`+-1`

B

`+-2`

C

`+-3`

D

`+-5`

Text Solution

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The correct Answer is:
C
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