Inverse Trigonometric Functions
RS Aggarwal
CBSE
Grade 12
Question:
Evaluate $\cos^{-1}\left(\cos \dfrac{13\pi}{6}\right)$.
Step-by-Step Solution
Key Concept: cos(13\pi/6) = cos(2\pi + \pi/6) = cos(\pi/6) => \pi/6.
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Correct Answer:
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