1) The principal solutions of cotx=√3 are A) π6,7π6 B) π3,7π3 C) π4,5π4 D) π6,5π6 Answer: Option AExplanation: we have, cotx=√3 cotx=cotπ6 or cot(π+π6) ∴ x=π6,7π6 ∴ principal solution is π6,7π6