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A 14-foot ladder is perched on a vertical pole. The ladder is sliding so that the...

A 14-foot ladder is perched on a vertical pole. The ladder is sliding so that the base of the ladder is moving away from the pole at a rate of 2 ft / min. How fast is the angle between the top of the ladder and the vertical pole changing, the instant the top of the ladder is 8 feet off the ground?

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