If alpha in [-2pi, 2pi] and cos.(alpha)/...

If `alpha in [-2pi, 2pi]` and `cos.(alpha)/(2)+sin.(alpha)/(2)=sqrt(2)(cos 36^(@)-sin18^(@))`, then a value of `alpha`

A

`(7pi)/(6)`

B

`(pi)/(6) `

C

`-(5pi)/(6)`

D

`-(pi)/(6)`

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The correct Answer is:

A, D

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