二维函数的导数

GeoGebra 命令及参数

1. Derivative(a, y) → c
2. Derivative(a, x) → b
3. PointIn(a) → A
4. Vector(A, C) → D_x
5. Vector(A, D) → D_y
6. Textfield(a) → InputBox1
7. LaTeX(D_x, true, true) → text1
8. LaTeX(D_y, true, true) → text2
9. Vector(A, A + D_x + D_y) → grad
10. LaTeX(grad, true, true) → text3
11. Vector(A, B) → rateChange
12. LaTeX(rateChange, true, true) → text4
13. Circle(A, 1, zAxis) → d
14. Point(d) → E
15. Vector(A, E) → u
16. Vector(A, A + u + (0, 0, (grad * u))) → v