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If the angles of depression of the upper...

If the angles of depression of the upper and lower ends of a lamp post from the top of a hill of height h metres are `alpha` and `beta` respectively, the height of the lamp post (in metres) is

A

a.`(h sin (beta+alpha))/(cos alpha sin beta)`

B

b.`(h sin (beta-alpha))/(cos alpha sin beta)`

C

c.`(cos alpha sin beta)/(h sin (beta+alpha))`

D

d.`(cos alpha sin beta)/(h sin (beta-alpha))`

Text Solution

Verified by Experts

The correct Answer is:
b
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