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Q)

The principal value of $\cos^{-1}\bigg(-\Large {\frac{1}{2}}\normalsize \bigg)$ is_____________.

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

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