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Let bar(a)= bar(i) + 2bar(j) + 3bar(k), bar(b)= - bar(i) + 2bar(j) + 3bar(k), bar( c)= 3 bar(i) + bar(j) and bar(d) is a non-zero vector perpendicular to both bar(a) and bar(b). If the angle between bar(c ) and bar(d) is theta, then find cos theta. |
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