x=[-5:0.01:2]';
y=sqrt((4-2.*x)./(4+x.^2));
plot(x,y);
title('Plot of #1');
xlabel('Time in second');
ylabel('Amplitude');
grid on
[ymax,indy]=max(y)
xm=x(indy)

ymax=1.0987
indy=418
xm=-0.8300