The angle between \( \hat{i} \) line of the intersection of the pla...

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The angle between \( \hat{i} \) line of the intersection of the plane \( \vec{r} \cdot(\hat{i}+2 \hat{j}+3 \hat{k})=0 \) and \( \vec{r} \cdot(3 \hat{i}+3 \hat{j}+\hat{k}) \)
\( \mathrm{P} \) \( =0 \) is

W
(1) \( \cos ^{-1}\left(\frac{1}{3}\right) \)
(2) \( \cos ^{-1}\left(\frac{1}{\sqrt{3}}\right) \)
(3) \( \cos ^{-1}\left(\frac{2}{\sqrt{3}}\right) \)
(4) none of these
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