This tip from frequent contributor Kent Cooper is used to draw polynomial functions on the current layer in AutoCAD. The routine will draw the curve defined by a polynomial function in the form y = a sum of coefficients on x raised to a descending series of any number of integer powers, and a constant. For a complete description of the functionality, download this tip and read Kent's well-written header in the LISP file. As with all of Kent's routines, the LISP file itself is well documented throughout.