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A ladder 13m long leans against a wall. ...

A ladder 13m long leans against a wall. The foot of the ladder is pulled along the ground away from the wall, at the rate of 1.5m/sec. How fast is the angle theta between the ladder and the ground is changing when the foot of the ladder is 12m away from the wall.

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MODERN PUBLICATION-APPLICATION OF DERIVATIVES-EXERCISE
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