1.

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

Answer»

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

ANSWER :B


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