MATLAB: Error Undefined x!

error

In my script, I call a function value to input values and put the input in another function integrnfn:
[A,x1,x2]=value;
y=integrfn(A,x1,x2);
fprintf('The value of the integral is %.3f', integrfn(A,x1,x2))
function [A,x1,x2]=value
A=input('Please enter a positive value: ');
x1=input('Please enter another positive value: ');
x2=input('Please enter a positive value that is greater than the previous one: ');
end 
function y=integrfn(A,x1,x2)
y=int(A*exp(-x^2)*cos(2*x)/(1+x^2),x,x1,x2);
end
However, when I run it, it says:
Undefined function or variable 'x'.
Error in script >integrfn (line 15)
y=int(A*exp(-x^2)*cos(2*x)/(1+x^2),x,x1,x2);
Error in the script (line 5)
y=integrfn(A,x1,x2);
Can someone tell me the problem?
Thank you!!

Best Answer

The int function is part of the Symbolic Math Toolbox. The most appropriate function is integral, with the integrand as an anonymous function:
y = integral(@(x) A*exp(-x.^2).*cos(2*x)./(1+x.^2),x1,x2);
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