The values of the apparent angles of dip in two planes at right angles to each other are $45^{\circ}$ and $30^{\circ}$ respectively. The true value of angle of dip at the place is ............

  • A

    $\cot ^{-1}(1)$

  • B

    $\cot ^{-1}(2)$

  • C

    $\cot ^{-1}(3)$

  • D

    $\cot ^{-1}(4)$

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