A) \[{{60}^{o}}\]
B) \[{{75}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{120}^{o}}\]
Correct Answer: B
Solution :
\[\cos \theta =\frac{4+6-{{(\sqrt{3}+1)}^{2}}}{2.2.\sqrt{6}}\Rightarrow \theta ={{75}^{o}}\].
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