A) \[{{30}^{o}}\]
B) \[{{45}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{75}^{o}}\]
Correct Answer: B
Solution :
\[a=2,b=\sqrt{6},c=\sqrt{3}+1\] \ \[\cos A=\frac{6+3+1+2\sqrt{3}-4}{2\sqrt{6}(\sqrt{3}+1)}\Rightarrow A={{45}^{o}}\].
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