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)Solution
The correct answer is D
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