clear variables;
a = 3;
b = -3;
n = 0:50;
x1 = sin(2*pi*0.1*n);
x2 = sin(2*pi*0.15*n);

%yn
x = x1*a + x2*b;
y = x .^2;

%y_tn
yt = a*(x1 .^2) + b*(x2 .^ 2);

d = round(y - yt, 10);

if d==0
    disp("liniar")
else
    disp("neliniar")
end