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If bar d is unit vector such that bar ...

If `bar d` is unit vector such that `bar d = (bar b xx bar c) + u = (bar c xx bar) +v= (bar a xx bar b))` then `|(bar d.bar a)(bar b xx bar c)+(bar d.bar b)(bar c xx bar a)+(bar d.bar c)(bar a xx bar b)|` is equal to

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