The principal value of the expression \( \cos ^{-1} \) \( \left[\co...
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The principal value of the expression \( \cos ^{-1} \) \( \left[\cos \left(-680^{\circ}\right)\right] \) is
\( \mathrm{P} \)
(1) \( \frac{2 \pi}{9} \)
(2) \( \frac{-2 \pi}{9} \)
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(3) \( \frac{34 \pi}{9} \)
(4) \( \frac{\pi}{9} \)
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