Trigonometryhard · Past Paper
Angle of elevation of top of tower from a point A is α. Walking distance 'd' towards it, it is β. Height h is:
Ad / (cotα - cotβ)
Bd / (tanβ - tanα)
Cd tanα tanβ
Dd sinα
✓ Correct Answer: A — d / (cotα - cotβ)
h cot α - h cot β = d. Therefore h = d / (cot α - cot β).
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