題組內容
7. [Hint: if f '(t)=kf(t), then f(t)=
]
(c) Find the directional derivative of the function f at the point (1, 2) in the direction of the vector 2i-3j.
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7. [Hint: if f '(t)=kf(t), then f(t)=]
(c) Find the directional derivative of the function f at the point (1, 2) in the direction of the vector 2i-3j.