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The angle of elevation of the highest po...

The angle of elevation of the highest point P of a vertical tower at point A on the horizontal ground is `45^(@)`. The height of tower is 'h'/ The angle of a elevation of the tower becomes `60^(@)` from B on moving a distance 'd' at `30^(@)` angle from the horizontal. Prove that: `d=h(sqrt(3)-1)`

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