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If veca,vecb,vecc are mutually perpendic...

If `veca,vecb,vecc` are mutually perpendicular vector and `veca=alpha(vecaxxvecb)+beta(vecbxxvecc)+gamma(veccxxveca) and [veca vecb vecc]=1 then vecalpha+vecbeta+vecgamma=` (A) `|veca|^2` (B) `-|veca|^2` (C) 0 (D) none of these

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