Junaid Mansuri wrote: > > I know that the Ti-85 calculator does der1( ) and der2( ) > but does anyone know how to take the third derivative of a function at x. > (I only need a numerical answer) > > Thanks a lot, > Junaid Mansuri > jmansuri@juno.com If I am not mistaken, there is a function on the TI-85 called nDer( ) that finds the derivative of any given order. -Tavis