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7. (7 marks) A television camera is positioned 8 km from a helicopter landing pad. The helicopter is rising vertically at a speed of 2

7. (7 marks) A television camera is positioned 8 km from a helicopter landing pad. The helicopter is rising vertically at a speed of 2 km/h. If the television camera is always kept aimed at the helicopter, how fast is the camera's angle of elevation changing when the helicopter is at 3 km altitude? (The angle of elevation is the angle between the ground and the camera's line of sight. )

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