f(x)=(x + 1/x);
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p=plot(f,(x,1/2,2), ticks=[[],[]], axes_labels=['$z$','$y$'],tick_formatter="latex")+text('$y = \sqrt{n}(z + 1/z)$', (1.8, 2.2), fontsize=16, color='black')+point((1,2),pointsize=35)+ text('$(1,2\sqrt{n})$', (1,2.03), fontsize=16, color='black');
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p.show();
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You should add points to include the edges of the interval as well. You can copy and paste the above code into a new worksheet of your own to mess around with it.
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