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if [ ( cos alpha, - sin alpha),(sin al...

if `[ ( cos alpha, - sin alpha),(sin alpha, cos alpha)]` and `A +A^1 =I` then `alpha =……`

A

No solution

B

`pi/3`

C

`pi`

D

`(3pi)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
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