Let \( \phi_{1} \) and \( \phi_{2} \) be the angle of dip observed in two vertical planes at rig...

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Let \( \phi_{1} \) and \( \phi_{2} \) be the angle of dip observed in two vertical planes at right angles to each other and \( \phi \) be the true dip then
(a) \( \cos ^{2} \phi=\cos ^{2} \phi_{1}+\cos ^{2} \phi_{2} \)
(b) \( \sec ^{2} \phi=\sec ^{2} \phi_{1}+\sec ^{2} \phi_{2} \)
(c) \( \tan ^{2} \phi=\tan ^{2} \phi_{1}+\tan ^{2} \phi_{2} \)
(d) \( \cot ^{2} \phi=\cot ^{2} \phi_{1}+\cot ^{2} \phi_{2} \)
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