The principal value of \( \cos ^{-1}\left(\frac{-1}{\sqrt{2}}\right) \) is (a) \( \frac{-\pi}{4}...

Описание

The principal value of \( \cos ^{-1}\left(\frac{-1}{\sqrt{2}}\right) \) is
(a) \( \frac{-\pi}{4} \)
(b) \( \frac{\pi}{4} \)
(c) \( \frac{3 \pi}{4} \)
(d) \( \frac{5 \pi}{4} \)
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