NCERT Class 12 · Ch 2 Exercise 2.2 · Q13
NCERT Class 12 Maths · Chapter 2 Inverse Trigonometric Functions · Exercise 2.2 Question 13
Evaluate cos⁻¹(cos(7π/6)).
💡 Concept Hints
- Recall the principal range of the inverse function before simplifying.
- Find an angle with the required trigonometric value, then verify it belongs to the principal range.
✅ Step-by-Step Solution
Final Answer: B: 5π/6.
- cos(7π/6)=−√3/2=cos(5π/6).
- Since 5π/6∈[0,π], the principal result is 5π/6, option B.
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