imo class 12 inverse trigonometric functions

The value of cos⁻¹(cos(−680°)) is:

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The value of cos⁻¹(cos(−680°)) is:

  • A. 40°
  • B. 320°
  • C. 140°
  • D. 220°

Answer: A) 40°

Explanation: cos(−680°) = cos(680°) = cos(2×360°−40°) = cos40°. cos⁻¹(cos40°) = 40° as 40° ∈ [0, 180°].

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