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If A=[{:(cosalpha,-sinalpha),(sinalpha,c...

If `A=[{:(cosalpha,-sinalpha),(sinalpha,cosalpha):}]andA+A=I`,then the value of `alpha` is ........
(A) `(pi)/(6)`
(B) `(pi)/(3)`
(C ) `pi`
(D) `(3pi)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
(B) `(pi)/(3)`
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