A 15 foot ladder is leaning against a wall. The base of the ladder is pushed towards the wall and slides along the ground at a speed of 2 ft/ sec. At what rate is the angle between the ground and the ladder changing when the top of the ladder is 12feet from the ground

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Chapter1: Trigonometry
Section1.1: Radian And Degree Measure
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A 15 foot ladder is leaning against a wall. The base of the ladder is pushed towards the wall and slides along the ground at a speed of 2 ft/ sec. At what rate is the angle between the ground and the ladder changing when the top of the ladder is 12feet from the ground  

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