x=.1:.1:10;k=max(size(x));
for t=1:k

y(t)=log(1+1/x(t))-2/(2*x(t)+1);
z(t)=1/((x(t)^2+x(t))^.5)-log(1+1/x(t));
hold on
end
semilogx(x,y)
semilogx(x,z)
grid