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Q)

Find the principal values of the following: $cos^{-1} \bigg(-\frac {1} {2} \bigg ) $

$\begin{array}{1 1} \frac{\pi}{3} \\ \frac{-\pi}{3} \\ \frac{2 \pi}{3} \\ \frac{-2\pi}{3} \end{array} $

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