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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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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 0 is given by :

(1)cot2θ=cot2θ1+cot2θ2(2)tan2θ=tan2θ1+tan2θ2(3)cot2θ=cot2θ1cot2θ2(4)tan2θ=tan2θ1tan2θ2

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