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

`b tan alpha tan beta`

`b tan alpha cot beta`

`b cot alpha cot beta`

`b cot alpha tan beta`

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MCGROW HILL PUBLICATION-HEIGHTS AND DISTANCES -EXERCISE (LEVEL-1 ( SINGLE CORRECT ANSWER TYPE QUESTIONS ))

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