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 t ^(2) phi = cot ^(2) phi_(1)+ cot ^(2) phi _(2)`

`tan ^(2) phi = tan ^(2) phi+ tan ^(2) phi _(2)`

`cot phi = tan ^(2) phi _(1) + cot phi _(2)`

`tan phi = tan phi _(1) + tan phi _(2)`

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