OpenStax, Algebra and Trigonometry 2e §8.3 Inverse Trigonometric Functions · Exercise 2 · Trigonometry · Inverse functions

Inverse Trigonometric Functions · Exercise 2

Since the functions $y = cos x$ and $y = co s^{- 1} x$ are inverse functions, why is $co s^{- 1} (cos (- \frac{π}{6}))$ not equal to $- \frac{π}{6} ?$

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OpenStax, Algebra and Trigonometry 2e · §8.3 Inverse Trigonometric Functions · Exercise 2

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