A) \[30{}^\circ \]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) \[90{}^\circ \]
Correct Answer: C
Solution :
\[\cos \theta =\frac{1\,(\sqrt{3}-1)-1\,(\sqrt{3}+1)+2\times 4}{\sqrt{6}\,\sqrt{24}}=\frac{6}{12}\,\,\Rightarrow \,\,\theta ={{60}^{o}}\].You need to login to perform this action.
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