A) \[30{}^\circ \]
B) \[45{}^\circ \]
C) \[0{}^\circ \]
D) \[60{}^\circ \]
Correct Answer: D
Solution :
\[\theta ={{\cos }^{-1}}\,\left[ \frac{2-1+2}{\sqrt{6}\sqrt{6}} \right]={{\cos }^{-1}}\left( \frac{3}{6} \right)={{60}^{o}}\].
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