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In a methane \( \left(\mathrm{CH}_{4}\right) \) molecule each hydrogen atom is at a corner of a regular tetrahedron with
\( \mathrm{P} \) the carbon atom at the centre. In coordinates

W where one of the \( \mathrm{C}-\mathrm{H} \) bonds is in the direction of \( \hat{i}+\hat{j}+\hat{k} \), an adjacent \( \mathrm{C}-\mathrm{H} \) bond is in the \( \hat{i}-\hat{j}-\hat{k} \) direction. Then angle between these two bonds is:-
(1) \( \cos ^{-1}\left(-\frac{2}{3}\right) \)
(2) \( \cos ^{-1}\left(\frac{2}{3}\right) \)
\( (3) \cos ^{-1}\left(-\frac{1}{3}\right) \)
(4) \( \cos ^{-1}\left(\frac{1}{3}\right) \)
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