f(x,y)=­õ(1-x^2-y^2) ¤ÎÊÐƳ´Ø¿ô, f_x, f_{xx}, f_{xy}, f_{xxxyy}

Mathematica ¥×¥í¥°¥é¥àÎã

1. f[x_,y_]:=Sqrt[1-x^2-y^2]
2. D[f[x,y],x]
3. D[f[x,y],{x,2}]
4. D[f[x,y],x,y]
5. Derivative[3,2][f][x,y]

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