Given that `vec(A)+vec(B)=vec(C )`. If `|vec(A)|=4, |vec(B)|=5` and `|vec(C )|=sqrt(61)`, the angle

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Given that `vec(A)+vec(B)=vec(C )`. If `|vec(A)|=4, |vec(B)|=5` and `|vec(C )|=sqrt(61)`, the angle between `vec(A)` and `vec(B)` is
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