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Let OP,OQ, OR are three edges of a regul...

Let `OP,OQ, OR` are three edges of a regular tetrahedron of edge length `a`. If `vec p`, `vec q` and `vec r` are the position vectors of the points `P,Q` and `R` & `O` is the origin then `|vec p timesvec q+vec q timesvec r+vec r timesvec p|` is equal to

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