The principal value of \( \cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(...

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The principal value of \( \cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right\} \) is
\( \mathrm{P} \)
W
(a) \( \frac{3 \pi}{20} \)
(b) \( -\frac{1}{\sqrt{2}} \)
(c) 1
(d) none of these
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