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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

`h sin (beta-alpha)`

B

`(h sin (beta-alpha))/(sin beta)`

C

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

D

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

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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