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A tower subtends an angle alpha at...

A tower subtends an angle ` alpha` at a point A in the plane of its base and the angle of depression of the foot of the tower at a point b ft hust above A is ` beta ` . Then the height of the tower is

A

b tan `alpha cot beta `

B

`b cot alpha tan beta `

C

`b cot alpha cot beta `

D

`b tan alpha tan beta `

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The correct Answer is:
A
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