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[" 3.If a unit vector a makes angles "pi/3" with "i,pi/4" with "j pi/4" with "j" and "theta in(0,pi)" with "dot k" ,then a value of "theta" is "],[[" (A) "(2 pi)/(3)," (B) "(pi)/(4)," (C) "(5 pi)/(6)," (D) "(5 pi)/(12)]]

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