MacLaurin and Taylor series with a Ti84 plus Basic program
1: The program MacLaurin.8xp
First the MacLaurin series program is explained, After that the Taylor series program. The program MacLaurin.8xp calculates the first 6 terms numerically of the MacLaurin series of a function around x=0. MacLaurin series is a special type of Taylor series (series around x=0) and is used in computer science, calculus, physics and higher-level mathematics. It is a series that is used to create an estimate (guess) of what a function looks like. To calculate the terms of the MacLaurin series, a Ti Basic program is written. The program will be demonstrated on the basis of some well-known series. For the MacLaurin series, it yields:
Example 1 : series of sin(x)
The program : MacLaurinseries.8xp
Example 1: MacLaurin series of sin(x)
sin(x)=x-0.1666x+0.00833x^3. The results show an excellent performance for the Ti-84 and can be used as a check of your analytically derived limit.
Example 2
Error in the 5th term (f) = (.02740-.02734)*100%/0.2734 =0.22%.
Conclusion: Results of the Ti84 agree very well with the analytical results, but be aware that the Ti84 results are calculated with a numerical program and give a good approximation of the analytical results. Download the program intended for Ti84plus CE or Ti84plus (older version):
2: The program Taylor.8xp
The MacLaurin series is the Taylor series of f(x) for x =0.The Taylor series are more general and are defined as :
To calculate the terms of the Taylor series, a Ti Basic program is written. The program will be demonstrated on the basis of some well-known series.
Example 1 :
Find the Taylor polynomials for f(x)=ln(x ) at x=1 . The analytical solution results in :
p(x) = (x-1) -0.5(x-1)^2+ (1/3)(x-1)^3
The Ti84 program Taylor.8xp gives next results
Comparison results
Analytical Ti84
term 1 1 1
term 2 -0.5 -0.50005
term 3 1/3 0.33347
Results show that the ti84 program is very accurate in computing the series. But you have to consider that the Ti84 program is a numerical program. The program is a good tool to calculate Taylor series or to check analytical results
A good exercise of the Taylor program is the following example on YouTube : https://www.youtube.com/watch?v=fLI-d96WsV0. Calculate the Taylor series with the program Taylor.8xp for f(x)=6/x with a=6 and conclude that the Ti results agree well with the results on YouTube.
Conclusion: Results of the Ti84 agree very well with the analytical results, but be aware that the Ti84 results are calculated with a numerical program and give a very good approximation of the analytical results. . More information about Taylor and MacLaurin series can be found on: https://en.wikipedia.org/wiki/Taylor_series
Download the program Taylor.8xp :
