Re: Divide by zero error when trying to create a graph

That will be due to the quick-plot ranges that Mathcad applies for the graph.

If you look at the quickplot tab on the properties menu: Mathcad is plotting this over the range -5 to 5.

for r*cosTheta - no problem

but when you change to 1/r cos theta then there is a 1/0 issue at the mid point.

Changing the quick plot range will allow you to plot a graph but can be tricky to get a correct look.

Regards

     Andy