1.

An obserever finds that the angular elevation of a tower is theta.On advancing a metres towards the tower the elevation is 45^(@) and an advancing 'b' metres nearer the elevation is 90^(@)-theta then the height of the tower in metres is

Answer»

`(AB)/(a+B)`
`(ab)/(a-b)`
`(2AB)/(a+b)`
`(2ab)/(a-b)`

ANSWER :B


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