You appear to be on a device with a "narrow" screen width (i.e. you are probably on a mobile phone). Due to the nature of the mathematics on this site it is best views in landscape mode. If your device is not in landscape mode many of the equations will run off the side of your device (should be able to scroll to see them) and some of the menu items will be cut off due to the narrow screen width.
If you would like to link to one of the pdf files for the page you were on (Differential Equations / Partial Differential Equations / Vibrating String) the URL's for each of the pdf files that are available are below.Book URL's
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=B,1,N
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=C,78,N
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=S,478,N
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