Having difficulty performing symbolic integral

In my code the part im trying to calculate A0 , A1,A2 and zerolift i get the following error

Invalid indexing or function definition. Indexing must follow
MATLAB indexing. Function arguments must be symbolic variables,
and function body must be sym expression.

please someone help me.

Thank you,

syms xc tetan 
alpha=input('alpha in D')
alpha=deg2rad(alpha); 
zc= 0.48*xc*(xc-1)^2;%change
dzdx=diff(zc,xc);%change
xc=0.5*(1-cos(tetan));
dzdx=(12*xc*(2*xc - 2))/25 + (12*(xc - 1)^2)/25;

%A0
int=int(dzdx,tetan,0,pi);
int=int/pi;
Anot=alpha-(int)
%A1
n=1

   int1=int(dzdx*(cos(1*tetan)),tetan,0,pi);%first part
    A1=(2/pi)*(int1)
  %A2
  n=2
   int2=int(dzdx*(cos(2*tetan)),tetan,0,pi);%first part
    A2=(2/pi)*(int2)
  %zerolift
  int3=int((cos(tetan)-1)*dzdx,tetan,0,pi)
  alphaZ=(-1/pi)*int1;

Answer 1

[Walter Roberson]

Your line

int=int(dzdx,tetan,0,pi);

redefines int from being a function into being a variable.

[Faraz Vossoughian]

so what would you suggest doing at this point?

[Walter Roberson]

Do not use int as a variable name.

temp1 = int(dzdx,tetan,0,pi);
temp2 = temp1 / pi;
Anot = alpha - temp2;