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      Question

      The angle of elevation of the top of a tower,

      vertically erected in the middle of a paddy field, from two points on a horizontal line through the foot of the tower are given to be α and β (α>β). The height of the tower is h unit. A possible distance (in the same unit) between the points is
      A h(cotβ – cota) / cos(a + β) Correct Answer Incorrect Answer
      B h (cota – cotβ) Correct Answer Incorrect Answer
      C h (tanβ – tana) / tana + tanβ Correct Answer Incorrect Answer
      D h (cata + cotβ) Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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