Question: Can you spot the problem in this plot of a parametric curve?

I am just learning Maple, but have plotted several parametric curves.  However, the attached code is giving me an error message that seems to be saying that my indices for the two elements of the curve vector are out of range.  I don't see why.  Can you explain?

Here's the file:  NewtonLeastResistanc.mw

Thanks for any help!

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