How can i correct this error "Parse error ´(´"

Ok so basically my problem is that while i was writing some functions i got this error "Invalid expression", it says in what line is the problem, but personally i have corrected it a couple times now and still the same, this is my code: (else function)

    if fB==0
        y=(B/A)*x;
    elseif fB==pi/2
        y=sqrt(B.^2*(1-((x.^2)/A.^2)));
    elseif fB==pi
        y=-(B/A)*x;
    else
       y = A*B*x*cos(fB)-sqrt((A.^2)*B.^2*(A.^2)*sin^2(fB)+(x.^2)*cos^2(fB)-x.^2)/(A.^2);
    end

Answer 1

[KSSV]

x=A*sin(w*t+fA);
y=B*cos(w*t+fB);
if fB==0
    y=(B/A)*x;
elseif fB==pi/2
    y=sqrt(B.^2*(1-((x.^2)/A.^2)));
elseif fB==pi
    y=-(B/A)*x;
else
    y = A*B*x*cos(fB)-sqrt((A.^2)*B.^2*(A.^2)*sin(fB)^2+(x.^2)*cos(fB)^2-x.^2)/(A.^2); %<-- change here 
end

[Ana María Hernández Salinas]

oh i see now the problem, the sin and cos, thank you very much, have a great night