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If x=sin alpha, y=sin(alpha+(4pi)/3),z=s...

If `x=sin alpha, y=sin(alpha+(4pi)/3),z=sin(alpha+(8pi)/3)`
`u=cos alpha, v=cos(alpha+(2pi)/3),w=cos(alpha+(4pi)/3)`
On the basis of above information, answer the following question:
`(xu+yv+zw)` equals

A

`sin 2 alpha`

B

`3/2 sin 2 alpha`

C

`3/2 cos 2 alpha`

D

`3 sin 2 alpha`

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