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Q)

Find the value of the expression $\cos^{-1} \bigg(\cos \frac{\large 7\pi}{\large 6} \bigg) $

\[ \begin{array} (A) \frac{7\pi}{6} \quad & (B) \frac{5\pi}{6} \quad & (C) \frac{\pi}{3} \quad & (D) \frac{\pi}{6} \end{array} \]

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