A non zero vector veca is parallel to th...

A non zero vector `veca` is parallel to the kine of intersection of the plane determined by the vectors `veri,veci+vecj` and the plane determined by the vectors `veci-verj, veci+veck` find the angle between `veca` and the vector `veci-2vecj+2veck`.

`pi/2`

`pi/3`

`pi/6`

`pi/4`

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