[math]
\begin{align}
&D_{\vec{u}} f(x,y) \\
&= \lim_{t \to 0} {f(x+t\cos\theta, y+t\sin\theta) \over t} \\
&= f_x(x,y)\cos\theta + f_y(x,y)\sin\theta \\
&= \nabla f \cdot \vec{u}
\end{align}
[/math]
- Resource Type
-
Activity
- Tags
-
- Target Group (Age)
- 14 – 18
- Language
- Chinese Traditional / 繁體中文
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