### Related

f:x^2+y^3;

fx:diff(f,x);

fy:diff(f,y);

Calculate

##### diff-plot3d-solve

k1(T):=10^(7.176-3.85...

k2(T):=10^(9.942-4.05...

OH:10^(pH-OH);

Calculate

##### diff-plot3d-sqrt

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

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

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

Calculate

##### diff-plot3d

f(x, y) := 4 - x^2 - ...

diff(f(x, y), x);

diff(f(x, y), y);

Calculate

##### diff-plot3d

f(x, y) := 4 - x^2 - ...

diff(f(x, y), x);

diff(f(x, y), y);

Calculate

##### diff-plot3d

f(x,y) := x*x+3*y;

dfx(f, x) := diff(f, x);

dfy(f, y) := diff(f, y);

Calculate

##### diff-plot3d

f(x, y) := 4 - x^2 - ...

diff(f(x, y), x);

diff(f(x, y), y);

Calculate

##### diff-plot3d-solve

f(x):=4*x^3-5*x^2-8*x...

solve(diff(f(x),x)=0,x);

plot3d([10-x^2-y^2,1,...

Calculate

f:x^2+y^3;

diff(f,x);

diff(f,y);

Calculate

f:x^2+y^3;

diff(f,x);

diff(f,y);

Calculate

### [diff,plot3d]

Run Example
```(%i1)f:x^2+y^3;
3    2
(%o1)                               y  + x
(%i2) diff(f,x);
(%o2)                                 2 x
(%i3) diff(f,y);
2
(%o3)                                3 y
(%i4) diff (f);
2
(%o4)                      3 y  del(y) + 2 x del(x)
(%i5)  	plot3d(f, [x,0,1], [y,0,1]);
plotplot3d(diff(f), [x,0,1], [y,0,1]);
plot```
Run Example
```f(x, y) := 4 - x^2 - 2*y^2;
2          2
(%o1)                    f(x, y) := 4 - x  + (- 2) y
(%i2) diff(f(x, y), x);
(%o2)                                - 2 x
(%i3) diff(f(x, y), y);
(%o3)                                - 4 y
(%i4) plot3d(4 - x^2 - 2*y^2, [x, 0, 5], [y, 0, 5]);
plot```
Run Example
```f(x, y) := 4 - x^2 - 2*y^2;
2          2
(%o1)                    f(x, y) := 4 - x  + (- 2) y
(%i2) diff(f(x, y), x);
(%o2)                                - 2 x
(%i3) diff(f(x, y), y);
(%o3)                                - 4 y
(%i4) f(3, 4);
(%o4)                                - 37
(%i5) plot3d(f(x, y), [x, 0, 5], [y, 0, 5]);
plot```

Help for Diff

Help for Plot3d