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The angle of elevation of the top of a tower from a point A due north of it is α and from a point B at a distance of 9 units due west of A is cos –1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 13 3 . If the distance of the point B from the tower is 15 units, then cot α is equal to :

1. 5 6
2. 5 9
3. 3 4
4. 3 7

Correct answer: 5 6

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