19. Evaluate = __⑲__

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Chia Chung

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2024/09/25

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2. A ladder 8 m long leans against a wall 4 m high. The lower end of the ladder is pulled away from the wall at a rate of 2 m/sec. How fast is the angle between the top of the ladder and the wall changing when the angle is 60° = π/3 radians?

19. Evaluate = ⑲

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