Problem with plotting functions and summarize from 1 to infinity

Hey! I have been working ith this exersice for a long time and it is the first time i work with plotting this type of functions. Could someone please help with how to do this?

I need espacially help with b and c

[Steven Lord]

Because this is a homework assignment, if you show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Jacob Andréasson]

syms n y x

F1=@(x,y)(8/(pi^2))*symsum((1/(n^2))*sin(n*pi/2)*cos(n*pi*y/6)*sin(n*pi*x/6),n,1,100)

x=0:0.1:6;

y=0:0.1:10;

plot3(x,y,F1)

This is the problems that i get with my script:

Error using plot3

Invalid data argument.

Error in Studio1TILL (line 16)

plot3(x,y,F1)