Sonya Kelsick asks << To all AP Calculus teachers:
I have just started using the Ostebee-Zorn book this year for Calculus AB. Many of my students own a TI-85 with some sort of program that will do basic tables. However, in our text, they often ask students to find limits of functions that are undefined at some value and difficult to analyze by just looking at the graph. The 82's and 83's table feature allows a much better picture of what is happening on either side of a given point. Does anyone know of a table program that will print "Error" or deal with undefined values on the TI-85? Thanks. >>
The attached file LIST.85p is my own table files for TI-85. (The name is LIST is, perhaps, a poor choice, but it lists the values of a function). Download and enter it into the TI-85s with the Graph-link.
Enter up to five functions as y1, y2, y3, y4, and / or y5. Then run the program. Follow the directions on the screen. After entering x, delta x and choosing a function the first time the program remembers the set up values and you only need change the ones you want to change.
It does not indicate a "division by zero" error. To avoid the problem 10^(-9) is added to the x-values used. Therefore you have to be very clever to actually divide by zero, yet the values with less than seven decimal places are accurate.