Aparant angle of a dip is 30° in a plane...

Aparant angle of a dip is `30°` in a plane at `45°` from the magnetic meridian, then the true dip is

A

`tan^(-1)(sqrt(2/3))`

B

`tan^(-1)(sqrt(6))`

C

`tan^(-1)(1/sqrt(6))`

D

`tan^(-1)(sqrt(3/2))`

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