Definite Integration (using MatLab Grader)

Hi i'm new to this program so i'm not really used to it.. i have an assignment due this week and i was hoping if someone can help me figure out what's wrong with my code.

Here is my code:

syms x;
f=@(x) int(sin(x) + x.^3 - exp(x) , [0 3]) ;
% #1 Part a
F1= - cos(x) + (x.^4)./4 - exp(x)  
N1a= F1, 0  % see the hint above
% #1 Part b
N1b= F1, 3
% #2 Part a
f2=@(x) int(2./(1+x.^2) , [0 sqrt(3)]) ;
F2= 2.*atan(x)
N2a= F2, 0
% #2 Part b
N2b= F2, (sqrt(3))

My output (what i get when i run the code) is this :

F1 =
x^4/4 - exp(x) - cos(x)
 
 
N1a =
x^4/4 - exp(x) - cos(x)
 

ans =
     3

 
N1b = 
x^4/4 - exp(x) - cos(x)
 

ans =
     0

 
F2 = 
2*atan(x)
 
 
N2a = 
2*atan(x)
 

ans =
    1.7321

 
N2b = 
2*atan(x)
 

ans =
     0

I'll attach the question and what i get wrong:

Answer 1

[Walter Roberson]

You have

N1a= F1, 0  % see the hint above

In MATLAB, this means:

Assign the expression in F1 to the variable N1a. Then display the result of the calculation to the user in the form

N1a =

(whatever the value is goes here)

Then calculate the result of executing the number 0. Then display the result of the calculation to the user in the form

ans =

      0

The question hints that you should use subs()