The principal value of cos⁻¹(−1/2) is:
The principal value of cos⁻¹(−1/2) is:
- A. −π/3
- B. 2π/3
- C. 5π/6
- D. π/3
Answer: B) 2π/3
Explanation: cos⁻¹(−x) = π − cos⁻¹(x). Thus, π − π/3 = 2π/3, which is in [0, π].
0 Answers
Log in to post your own answer or join the discussion.
No comments yet — start the discussion.