ti89guru

I have been involved in programming TI89s for over 10 years
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TI89 : Shell Method – Step by Step

Washer Method using the TI89 – Step by Step

Watch this how-to Washer Method video. It shows step by step how to find the volume of a solid of revolution using the Calculus Made Easy App to be downloaded at www.TI89.com

Watch: Do the Euler method using the TI89 Calculator- Step by Step –

Lagrange Multiplier using the TI89

When asked to apply the Lagrange Multiplier method it is time to pull out your trusty TI89 , open Calculus Made Easy (download www.TI89.com) , go to Multivariable Calculus under F6 3 , there select Lagrange Multiplier under F3 E . Enter Lagrange Multiplier problems as follow Just leave the box for the 2. constraint… (read more)

Runge Kutta 2. order using the Ti89

Say you have use the Runge Kutta-4 (RK4) Method to solve a 2. order Differential Equation such as : y”+5y’+y=Sin(x) y'(0)=-1 y(0)=1 h=.5 solve until y at x =1 Use the Numerical Made Easy app at TI89.com option F3 7 : After entering just press ENTER to view the solution: It is very easy to… (read more)

“Calculus Made Easy helps me better understand the process of solving equations, integrals and derivatives.”

Calculus Made Easy helps me better understand the process of solving equations, integrals and derivatives. It allows me to double check my work to ensure that I have the correct answer. It is a fantastic tool I highly recommend it for anyone taking a calculus course with a sub-par professor, or if you’re struggling with… (read more)

“Differential Equations Made Easy (TI-89) breaks down each step which really helps you understand the problem.

The Differential Equations Made Easy program saved me from hours of wasted studying. The program breaks down each step witch really helps you understand the problem. This also guarantees your answers are correct and gives you that peace of mind in Homework and beyond. The program itself is intuitive and easy to use. I opened… (read more)

Jacobian and Hessian Matrix using the TI89 in Calculus

Finding the Jacobian and Hessian Matrix using the TI89 is done with Calculus Made Easy from www.Ti89.com  navigating to the Multivariable Calculus menu under F6, then go to F3 to select Find Jacobian or Hessian. Check the screenshots below. To enter a vector-valued function use  [ , ]  notation to enter it on a TI89…. (read more)

Compute Mean, Mode, Median, Average, Standard Deviation, Range with a TI89 Calculator

Here is the quick way to find Mean, Mode, Median, Average, Standard Deviation, Variance, Range and more using the trusted TI89 : Just enter the list of numbers as shown in the image above. Press ENTER and Voila, all values are shown immediately. This is part of the comprehensive Statistics Made Easy app for the… (read more)

TI89 Titanium Cheat Sheets , Shortcut Keys, Custom Menus and Rename Programs

We have listed the following useful information at https://www.ti89.com/resources.php : TI89 Cheat Sheets Shortcut Keys Custom Menus Rename Programs This is a MUST KNOW for every savvy TI89 user: Learn how to use the TI89 efficiently by pressing the right buttons without searching. Did you know you can actually easily create you own custom menus… (read more)