Trigonometryhard · Past Paper
A balloon is at height 'h'. Angle of elevation from ground is α. It moves horizontally distance 'd' and elevation is β. Then d is:
Ah(cotβ - cotα)
Bh(tanα - tanβ)
Ch(sinα - sinβ)
Dh(cosβ - cosα)
✓ Correct Answer: A — h(cotβ - cotα)
Distance 1 = h cot α, Distance 2 = h cot β. d = |h cot β - h cot α|.
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