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A prson stands at a point A due south of...

A prson stands at a point A due south of a tower of height h and aboserves that its evelation is `60^(@).` He then walks westwards towards B, where the elevation is `45^(@).` At a point C on AB produced, show that if he find it to be `30^(@). OA, OB, OC` are in GP.

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