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From the top of a tower, the angle of de...

From the top of a tower, the angle of depression of a point on the ground is `60^@`. If the distance of this point from the tower is `1/(sqrt3+1)` metres, then the height of the tower is :

A

`(4 sqrt3)/2` metres

B

`(sqrt3+3)/2` metres

C

`(sqrt3-3)/2` metres

D

`(sqrt3)/2` metres .

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