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The angle of elevation of the top poi...

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 an angle `30^@` with AQ. Prove that `d=h(sqrt3-1)`.

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