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A person standing by the side of a road observes a row of equidistant telephone poles of equal height.Neglecting the height of the persons eye,the 10th and 17th poles subtend the same angle that they would do if they were in the position of the first pole and were respectively 1/2 and 1/3 of their height.find correct to one place of decimal,the secant of the angle between the base lines of the poles and the line drawn from the persons eye to the base of the first pole.

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