Sindbad~EG File Manager

<img src="graphs/graphfx.gif" >
<p>The most "ordinary" kind of graph is a graph of a function <em>y = f(x)</em>.  Such graphs nevertheless are sometimes hard to draw 
correctly.  This example shows a case that your graphing calculator will probably get wrong.   There are singularities at the places 
where the denominator is zero.  Notice that MathXpert does not draw mistaken vertical lines there; it "knows" that those are singularities,
rather than just places where the function goes suddenly from a large positive value to a large negative one, passing through the values
in between.  In fact, you can choose View | Singularities from the menu and see what the singularities of your function are.</p>