enter image description here

Hello, I have two problems.

the first is plotting 3D function, the domain is "0<x<y<1". (I could find examples like integrating function with domain 0<x<1, 0<y<1, but I could not find examples for a<x<y<b.)

the second is just Intergrating the funcntion below.


1 Answer 1


For the plot you can use RegionFunction, which takes a pure function which takes x, y, and z values::


enter image description here

Your second issue is fixed by spelling Integrate properly (notice that Intergrate is in blue, meaning that it is an undefined global variable), and by swapping the order of integration:

Integrate[Sqrt[x^2+y^2]/Pi, {x, 0, 1}, {y, -Sqrt[1-x^2], Sqrt[1-x^2]}]


  • 3
    $\begingroup$ Also, Plot3D[1/(1 - x), {x, 0, 1}, {y, x, 1}] $\endgroup$
    – Bob Hanlon
    Commented May 26, 2022 at 0:05
  • $\begingroup$ Wow... I had so many mistakes, really really thanks. $\endgroup$
    – jerryed
    Commented May 26, 2022 at 2:25

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