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[" 75"],[" 57If "vec a" and "vec b" are ...

[" 75"],[" 57If "vec a" and "vec b" are any two vectors of "],[" magnitude "1" and "2" ,respectively,and "],[(1-3vec a*vec b)^(2)+|2vec a+vec b+3(vec a timesvec b)|^(2)=],[47" ,then the angle between "vec a" and "vec b" is "],[[" (A) "pi/3," (B) "pi-cos^(-1)(1/4)],[" (C) "(2 pi)/(3)," (D) "cos^(-1)(1/4)]]

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