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Class 12 Inverse Trigonometric Functions · Conceptual Answer1 Marksprincipal_values

Class 12 Maths · Inverse Trigonometric Functions · Conceptual Answer #43

Evaluate \(\cos^{-1}[\cos(-680^\circ)]\), giving radians.

✅ Step-by-Step Solution

Final Answer: 2π/9
  1. −680° is coterminal with 40°; the principal arccosine is 40°=2π/9.
  2. 2π/9

📋 CBSE Stepwise Marking Scheme

  • [0.5 marks] −680° is coterminal with 40°; the principal arccosine is 40°=2π/9.
  • [0.5 marks] 2π/9

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