Question

${\cot }^{-1}(2+\sqrt{3})=$

• A. $\frac{\pi }{12}$
• B. $\frac{\pi }{15}$
• C. $\frac{\pi }{5}$
• D. $\frac{3\pi }{10}$

Answer 1

Answer: (A)

$2+\sqrt{3}=\cot 15^{\circ }$