## Archive for April, 2015

### support@ti89.com

Friday, April 24th, 2015

Reach us at support@ti89.com with any TI89 questions !

### How to launch an app on the TI89

Friday, April 24th, 2015

To Start an APP, either press APPS , next select FlashApps and select your desired APP OR
in case you have icons enables on your home screen : find the one named after the app (likely is a star icon) and press ENTER to launch app.

### Line Integral computation on the TI89 using Calculus Made Easy

Thursday, April 23rd, 2015

How to compute a line integral on the TI89 using Calculus Made Easy and

in the Vector Calculus module?

Lets look at  question 6  in the image below:

line integral on ti89

Disregarding i and j notation, we instead enter the following under F2 2 LIne Integrals:

f=[2y,2x]

[x,y]   as variables used.

Next screen:

We have to create our own parametrization using the given points. Since we Line Integrals are independent of path (read more here http://tutorial.math.lamar.edu/Classes/CalcIII/FundThmLineIntegrals.aspx  ) we choose

[t,3*t] which get as from 0,0 to 2,6 doesn’t it?

t    is variable

[0,2] as t bounds . Double check that those t values get you from 0,0 to 2,6 using the above parametrization.

Voila , a computer algebra system verified the answer 24 .  The Fundamental Theorem of Calculus just never fails, and so does Calculus Made Easy!

I leave question 7 as a challenge for you . Reply here if you know how 😉

Mike
TI89guru

### The TI89 Titanium looks great

Wednesday, April 22nd, 2015