Question

The value of, $\cot A \cdot \cot \left(60^{\circ}+ A \right)+\cot \left(60^{\circ}+ A \right)$ $\cdot \cot \left(120^{\circ}+ A \right)+\cot \left(120^{\circ}+ A \right) \cot A -$

• A. 3
• B. $-3$
• C. $3 / 2$
• D. $1 / 2$

Answer 1

Answer: (B)

Put $A =30^{\circ}$ then $0+0+-\sqrt{3} \cdot \sqrt{3}=-3$