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

If `A = [ (cos alpha ,- sin alpha ),(sin alpha ,cos alpha)]`, then A + A' = I then the value of ` alpha ` is :

A

`(pi)/( 6) `

B

` (pi)/( 3)`

C

` pi `

D

` (3 pi)/( 2)`

Text Solution

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The correct Answer is:
B
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