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If `veca, vecb, vecc` be three vectors of magnitude `sqrt(3),1,2` such that `vecaxx
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If `veca, vecb, vecc` be three vectors of magnitude `sqrt(3),1,2` such that `vecaxx(vecaxxvecc)+3vecb=vec0` if `theta` angle between`veca` and `vecc` then `cos^(2)theta` is equal to
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