Unrecognized function or variable

So I have made a funtion and an m-file for calling that function but for some reason when I run the my m-file it says that the y is unrecognized below is my function and m-file please help me with this error:

Function:

function B2FrequencyResponse10(E, W, A)
    K = 1;
    t = (0:1.0:10)';
    if (0 <= E) < 1
        y = K*A-K*A*exp(-(e)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
        if E == 1
            y = K*A-K*A*(1+W*t)*exp(-(W)*t);
            if E > 1
                y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*qrt(E^2-1)*t));
            end
        end
    end
    
    
    
    plot(t, y)
    title('Step Response of Second-Order System')
    xlabel('time') 
    ylabel('Output y(t)')
    legend('E = 0')
end

m-file:

clear
E = 0;
W = 2;
A = 1;
hold on

B2FrequencyResponse10(E, W, A);

Answer 1

[Torsten]

function B2FrequencyResponse10(E, W, A)
K = 1;
t = (0:1.0:10)';
if E >= 0 &  E < 1
    y = K*A-K*A*exp(-(E)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
elseif E == 1
    y = K*A-K*A*(1+W*t).*exp(-(W)*t);
elseif E > 1
    y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*sqrt(E^2-1)*t));
end
plot(t, y)
title('Step Response of Second-Order System')
xlabel('time') 
ylabel('Output y(t)')
legend('E = 0')
end

Answer 2

[Davide Masiello]

clear,clc

E = 0;
W = 2;
A = 1;
t = (0:1.0:10)';
y = B2FrequencyResponse10(t,E,W,A);

plot(t,y)
title('Step Response of Second-Order System')
xlabel('time') 
ylabel('Output y(t)')
legend('E = 0')

function y =B2FrequencyResponse10(t,E,W,A)
K = 1;
if E >= 0 && E < 1
    y = K*A-K*A*exp(-(E)*W*t)*(E/sqrt(1-E^2))*sin(W*sqrt(1-E^2)+cos(W*sqrt(1-E^2)));
elseif E == 1
    y = K*A-K*A*(1+W*t)*exp(-(W)*t);
else
    y = K*A-K*A*((E+sqrt(E^2-1))/2*sqrt(E^2-1)*exp(-(E)+sqrt(E^2-1)*W*t)+cos*(W*qrt(E^2-1)*t));
end
end