If theta(1) and theta(2) be the apparent...

If `theta_(1)` and `theta_(2)` be the apparent angles of dip observed in two verticle planes at right angles to each other, then the true angle of dip `theta` is given by

`cos^2 phi = cos^2 phi_1 + cos^2 phi_2`

`sec^2 phi = sec^2 phi_1 + sec^2 phi_2`

`tan^(2 ) phi = tan^2 phi_1 + tan phi_2`

` cot^2 phi = cot^2 phi_1 + cot^2 phi_2`

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