In R^(2) , find the unit vector orthogo...

In ` R^(2)` , find the unit vector orthogonal to unit vector `vec(x) = ( cos alpha , sin alpha )`

A

`( cos alpha//2, sin alpha//2)`

B

`(- cos alpha, - sin alpha)`

C

` (- sin alpha, cos alpha)`

D

` ( cos alpha, sin alpha)`

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