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If `( vec axx vec b)xx( vec cxx vec d)`.`( vec axx vec d)=0` , then which of the following may be true? (a) ` vec a , vec b , vec ca n d vec d` are necessarily coplanar (b) ` vec a` lies in the plane of ` vec ca n d vec d` (c) ` vec b` lies in the plane of ` vec aa n d vec d` (d) ` vec c` lies in the plane of ` vec aa n d vec d`

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