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If A = ({:(0, sin alpha),(sinalpha,0):})...

If `A = ({:(0, sin alpha),(sinalpha,0):})` and det `( A^(2) - ( 1)/( 2) I )=0` , then a possible value of `alpha` is `:`

A

`( pi )/(2)`

B

`(pi )/(3)`

C

`(pi)/( 6)`

D

`(pi)/(4)`

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