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A tower subtends an angle alpha at a poi...

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 just above A is `beta`. Then the height of the tower is

A

`l tan beta cot alpha`

B

`l tan alpha cot beta`

C

`l tan alpha tan beta`

D

`l cot alpha cot beta`

Text Solution

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The correct Answer is:
B
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