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The angle between two vectors

Question:

The angle between two vectors $\vec{a}$ and $\vec{b}$ with magnitudes $\backslash 3$ and 4 , respectively, and $\vec{a} \cdot \vec{b}=2 \sqrt{3}$ is

(A) $\frac{\pi}{6}$

(B) $\frac{\pi}{3}$

(C) $\frac{\pi}{2}$

(D) $\frac{5 \pi}{2}$

Solution:

The correct option is (B).

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