The value of cos⁻¹(cos 13π/6) is:
The value of cos⁻¹(cos 13π/6) is:
- A. 13π/6
- B. π/6
- C. 5π/6
- D. 7π/6
Answer: B) π/6
Explanation: 13π/6 = 2π + π/6. cos(13π/6) = cos(π/6). Since π/6 ∈ [0, π] (principal branch of cos⁻¹), cos⁻¹(cos 13π/6) = π/6.
0 Answers
Log in to post your own answer or join the discussion.
No comments yet — start the discussion.