用Maple求偏导数

f:=(x,y)->x^2*sin(2*y);

fx:=diff(f(x,y),x);

fy:=diff(f(x,y),y);

 或

f:=(x,y)->x^2*sin(2*y);

fx:=D[1](f)(x,y);

fy:=D[2](f)(x,y);

 

 

 

 

f:=(x,y)->x^2+3*x*y+y^2;

fx:=D[1](f)(1,2);

fy:=D[2](f)(1,2);

 

 

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