The principal value of \( \sin ^{-1}\left(\cos \frac{10 \pi}{7}\right) \)....

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The principal value of \( \sin ^{-1}\left(\cos \frac{10 \pi}{7}\right) \)
\( \mathrm{P} \)
(1) \( \frac{3 \pi}{7} \)
(2) \( \frac{\pi}{14} \)
(3) \( \frac{-\pi}{7} \)
(4) None of these


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