Question

The value of cot 5${}^{\circ }$ cot 10${}^{\circ }$_______cot 85${}^{\circ }$ is

• A. $\frac{1}{\sqrt{2}}$
• B. 1
• C. $\frac{1}{2}$
• D. 0

Answer 1

Answer: (B)

Correct answer is (b) 1