A man is standing on the deck of a ship which is 8 m above water level. He observes the angle of elevation of the top of

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Q 3020067811.     A man is standing on the deck of a ship which is 8 m above water level. He observes the angle of elevation of the top of a hill as 60^{\circ} and the angle of depression of the base of the hill as  30^{\circ}. If the distance of the hill from the ship given by a\sqrt b, then find the value of a-b.

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