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The base of the pyramid A O B C is an eq...

The base of the pyramid `A O B C` is an equilateral triangle `O B C` with each side equal to `4sqrt(2),O` is the origin of reference, `A O` is perpendicualar to the plane of ` O B C` and `| vec A O|=2.` Then find the cosine of the angle between the skew straight lines, one passing though `A` and the midpoint of `O Ba n d` the other passing through `O` and the mid point of `B Cdot`

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