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The angle of elevation of to be top poin...

The angle of elevation of to be top point `P` of the vertical tower PQ of height `h` from poin A is `45^0` and from a point B, the angle of elevation is `60^0,` where B is point at a distance `d` from the point A measured along the line `A B` which makes an angle `30^0` with AQ. Prove that `d=(sqrt(3)-1)hdot`

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