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

A tower subtends an angle alpha at a point on the same level as the foot of the tower and at the second point h metres above the first the angle of depression of the base of a tower is beta The height of the tower

A

`b cot alpha . tan beta`

B

`b tan alpha . cot beta`

C

`b tan alpha . tan beta`

D

`b cot alpha . cot beta`

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