The value of cos⁻¹(cos(7π/6)) is:
The value of cos⁻¹(cos(7π/6)) is:
- A. 7π/6
- B. −π/6
- C. 5π/6
- D. π/6
Answer: C) 5π/6
Explanation: 7π/6 is outside [0, π]. cos(7π/6) = cos(2π − 5π/6) = cos(5π/6). Hence, cos⁻¹(cos(5π/6)) = 5π/6.
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