If `theta_1` and `theta_2` be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip `theta` is given by

Options

A. `cot ^(2) theta = cot ^(2) theta _(1) + cot ^(2) theta _(2)`
B. `tan ^(2) theta= tan ^(2) theta _(1) + tan^(2) theta_(2)`
C. `cot ^(2) theta = cot ^(2) theta _(1) + cot^(2) theta _(2)`
D. `tan ^(2) theta = tan ^(2) theta _(1) - tan ^(2) theta _(2)`

Answer

A