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9. [3 marks ] A man standing on a cliff is watching his daughter swim to shore through a telescope. The telescope is 50m above

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9. [3 marks ] A man standing on a cliff is watching his daughter swim to shore through a telescope. The telescope is 50m above water level and the girl is swimming at 25m/min. At what rate is the angle between the telescope and the cliff changing when she is 50m from shore

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