Which of the following is/are the value of \( \cos \left[\frac{1}{2} \cos ^{-1}\left(\cos \left(...
Which of the following is/are the value of \( \cos \left[\frac{1}{2} \cos ^{-1}\left(\cos \left(-\frac{14 \pi}{5}\right)\right)\right] ? \)
(1) \( \cos \left(-\frac{7 \pi}{5}\right) \)
(2) \( \sin \left(\frac{\pi}{10}\right) \)
(3) \( \cos \left(\frac{2 \pi}{5}\right) \)
(4) \( -\cos \left(\frac{3 \pi}{5}\right) \)
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