Apparent dips when dip circle is placed in two mutully perpendicula...

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Apparent dips when dip circle is placed in two mutully perpendicular directions are \( 30^{\circ} \) and \( 45^{\circ} \). What is the actual dip at that place?
(1) \( \tan ^{-1}(2) \)
(2) \( \tan ^{-1}\left(\frac{1}{2}\right) \)
\( \tan ^{-1}(\sqrt{2}) \)
(4) \( 60^{\circ} \)
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