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Let veca, vecb and vecc are three mutual...

Let `veca, vecb and vecc` are three mutually perpendicular unit vectors and a unit vector `vecr` satisfying the equation `(vecb -vecc)xx(vecr xx veca)+(vecc -veca)xx(vecr xx vecb)+(veca-vecb)xx(vecr xx vecc)=0,` then `vecr` is

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If vecb is not perpendicular to vecc . Then find the vector vecr satisfying the equation vecr xx vecb = veca xx vecb and vecr. vecc=0

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