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Angles of dip in two vertical planes at ...

Angles of dip in two vertical planes at right angles to each other are `cot^(-1) (1/2)` and `cot^(-1)(1/3)` respectively.True angle of the dip is

A

`cot^(-1)(sqrt(36/13))`

B

`cot^(-1)(sqrt(5/6))`

C

`cot^(-1)(13/36)`

D

`cot^(-1)(sqrt(13/36))`

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