x = linspace(1,2,11);

y(1,:) = x.^3 + 3.*x.^2 + 1
y(2,:) = sin(x.^2)
y(3,:) = (sin(x)).^2
y(4,:) = sin(2.*x) + x.*cos(4.*x)
y(5,:) = x ./ (x.^2 + 1)
y(6,:) = cos(x) ./ (1 + sin(x))
y(7,:) =  1./x + x.^3 / (x.^4 + 5.*x.*sin(x))

for i = 1 : 7
    subplot(4,2,i), plot(y(i,:), x), grid
    xlabel('x'), ylabel('y')
end