17. Find the directional derivative = __⑰__ of f(x,y) = x² + 3y² at P(1,1) in the direction of Q(4, 5).

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Chia Chung

詳解 #6196819

2024/08/22

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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?

17. Find the directional derivative = ⑰ of f(x,y) = x² + 3y² at P(1,1) in the direction of Q(4, 5).

詳解 (共 1 筆)

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