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If \( \phi_{1} \) and \( \phi_{2} \) are the apparent angles of dip observed in two vertical planes at right angles to each other and the true angle of dip is \( \phi \) at that place, then
(1) \( \tan ^{2} \phi=\tan ^{2} \phi_{1}+\tan ^{2} \phi_{2} \)
(2) \( \tan ^{2} \phi=\cot ^{2} \phi_{1}+\cot ^{2} \phi_{2} \)
(3) \( \cot ^{2} \phi=\cot ^{2} \phi_{1}+\cot ^{2} \phi_{2} \)
(4) \( \cos ^{2} \phi=\cos ^{2} \phi_{1}+\cos ^{2} \phi_{2} \)
\( \mathrm{P} \)
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