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A tower, x metres, has a flagstaff at it...

A tower, x metres, has a flagstaff at its top. The tower and the flagstaff subtend equal angles at a point distant y metres from the foot of the tower. The length of the flagstaff (in metres) is

A

`(y(x^(2)-y^(2)))/(x^(2)+y^(2))`

B

`(x(y^(2)+x^(2)))/(y^(2)-x^(2))`

C

`(x(x^(2)+y^(2)))/(x^(2)-y^(2))`

D

`(x(x^(2)-y^(2)))/(x^(2)+y^(2))`

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