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If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by

  • cot2θ = cot2θ1+ cot2θ2

  • tan2θ = tan2θ1+ tan2θ2

  • cot2θ = cot2θ1– cot2θ2

  • tan2θ = tan2θ1– tan2θ2

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