Matlab - expresar resultado de un función

an=45;

r=20;

f=60;

l=40;

v=120;

a=an/180*pi;

z=(r^2+(2*pi*f*l/1000)^2)^0.5;

fi=atan((2*pi*f*l/1000)/r);

x0=pi;

funx=@ (x) sin(x-fi)-sin(a-fi)*exp((a-x)/tan(fi));

sol=fzero(funx,x0);

b=sol;

syms x1

io2=((v*sqrt(2)/z)*(sin(x1-fi)-sin(a-fi)*exp((a-x1)/tan(fi))))^2;

f3=io2;

F3= inline(char(f3));

F3=int(f3,a,b)

Iorms=(eval(F3)/(2*pi))^0.5;

clear all

an=45;

r=20;

f=60;

l=40;

v=120;

a=an/180*pi;

z=(r^2+(2*pi*f*l/1000)^2)^0.5;

fi=atan((2*pi*f*l/1000)/r);

x0=pi;

funx=@ (x) sin(x-fi)-sin(a-fi)*exp((a-x)/tan(fi));

sol=fzero(funx,x0);

b=sol;

syms x1

io2=((v*sqrt(2)/z)*(sin(x1-fi)-sin(a-fi)*exp((a-x1)/tan(fi))))^2;

f3=io2;

F3= inline(char(f3));

F3=int(f3,a,b);

Iorms=(double(F3)/(2*pi))^0.5;

disp(Iorms)