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Points vec a , vec b , vec c ,a n d vec...

Points ` vec a , vec b , vec c ,a n d vec d` are coplanar and `(sinalpha) vec a+(2sin2beta) vec b+(3sin3gamma) vec c- vec d=0.` Then the least value of `sin^2alpha+sin^2 2beta+sin^2 3gammai s` a. `1/(14)` b. `14` c. `6` d. `1//sqrt(6)`

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