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 y metres from the foot of the tower. Then the length of the flagstaff in metresis

Answer»

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