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A non vector veca is parallel to the lin...

A non vector `veca` is parallel to the line of intersection of the plane determined by the vectors `veci,veci+vecj` and thepane determined by the vectors `veci-vecj,veci+veck` then angle between `veca and veci-2vecj+2veck` is = (A) `pi/2` (B) `pi/3` (C) `pi/6` (D) `pi/4`

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