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The angle of elevation of the top point ...

The angle of elevation of the top point P of the vertical tower PQ of height h from a point A is
`45^@` and from a point B, the angle of elevation is
`60^@`, where B is a point at a distance d from the point A measured along the line AB which makes angle
`30^@` with AQ. Prove that
`d=h(sqrt3-1)`.

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