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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 1.    h(cotβ – cota) / cos(a + β) 2.    h (cota – cotβ) 3.    h (tanβ – tana) / tana + tanβ 4.    h (cata + cotβ)
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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