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How do you evaluate ${cos}^{- 1} (cos (- \frac{2}{3} π))$ $cos^-1(cos(-2/3pi))$ ?

1 Answer

A. S. Adikesavan

Feb 16, 2016

- $\frac{2}{3}$ $2/3$ $π$ $pi$

Explanation:

If O is an operator, ((inverse O)(O) is unit operator 1.

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