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Let Delta,gradin{wedge,vv} be such that ...

Let `Delta,gradin{wedge,vv}` be such that `pgradqimplies ((p Deltaq)grad r)` is a tautology. Then `(p grad q) Deltar` is logically equivalent to :

A

`(pDeltar)vvq`

B

`(pDeltar)wedgeq`

C

`(pwedger)Deltaq`

D

`(pDeltar)wedgeq`

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