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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)`b tanalphacot beta` b)`bcotalphatanbeta`
c)`bcotalphacotbeta` d)`btanalphatanbeta`

A

`b tanalphacot beta`

B

`bcotalphatanbeta`

C

`bcotalphacotbeta`

D

`btanalphatanbeta`

Text Solution

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The correct Answer is:
A
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