Let* be the angle between the vectors ₁ and ₂. Let be the angle between the lines l₁ and ₂. We have cos (0*) = and 0* = 0= V₁ V2 ||v₁|||||v₂||| (in radian) (in radian) (write the numerical value of ₁2, ||₁||and||₂||)

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