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`

`(7pi)/6`

`pi/6`

`-(5pi)/6`

`-pi/6`

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The correct Answer is:

A, D

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