Question about Texas Instruments TI-89 Calculator

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Doesnt solve integrates and derivatives

Whenever i try to solve an integrate or a derivative a message appears that says "non-algebraic variable in expression" i do exactly what the guidebook says...i even did the examples it had in it but that message appears in that situation too... what should i do???

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2 Answers

Re: doesnt solve integrates and derivatives

If you are using X as your variable try this. Hit the F4 key, press 4 and type X. This will delete the variable x from memory and you should be good to go.

Posted on Oct 04, 2007

Re: doesnt solve integrates and derivatives

Try clearing the memory of all the variables..that might solve the problem mohit

Posted on Oct 01, 2007

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On the CASIO Fx-9860GII, how does one do time derivatives ( i.e. (dx/dt or dy/dt)) for use with parametric functions? I am attempting to find the arc length of a parametric function.

To calculate the arc length of a curve you need the derivatives as functions of a variable not the derivatives at one point. If I were you I would read the manual for more complete information. Maybe if you wrote a program that does that.

Mar 24, 2014 | Casio FX-9750GPlus Calculator

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How can i solve integrals with ALGEBRA FX 2.0 PLUS

The syntax for the evaluation of definite integrals (integrals with boundary limits) is as shown on the screen capture below.

$ (function , variable , lower bound, upper bound)
By default the name of the dummy variable is x. If you use another name, the variable must appear as an argument of the function, and as variable.


Mar 13, 2012 | Casio Algebra FX 2.0 Calculator

1 Answer

Can the casio fx9750gplus calculator show differentiation/integration etc. for example differentiate 5x^3 and have it show 15x^2?

Sorry to disappoint you but the Casio FX-9750Gplus does not handle symbolic calculations. It does not have a Computer Algebra System or CAS. It can however calculate the numerical integration of a function between two limits, as well as the first and second derivatives of a function at a given point.

  1. To access the numerical integration and differentiation,
  2. Press the Menu button.
  3. Highlight the RUN icon and press [ENTER/EXE]
  4. Press [OPTN][F4:CALC]. Then
  • Press [F2:d/dx] for first derivative
  • Press [F3:d^2/dx^2 for second derivative,
  • or [F4:integral]

Nov 01, 2010 | Casio FX-9750GPlus Calculator

1 Answer

Derivative feature does not work

The newer version of the OS is quite different from the initial version. It would be a good idea to upgrade the OS.
Back to your question. Since I upgraded my calculator, I am unable to illustrate the calculations with screen captures that are meaningful to you. If you do not mind I will show you how to calculate derivatives and integrals using OS Version

In Calculator Mode
  1. Press the Menu button.
  2. Use down arrow to highlight 4:Calculus or just press 4
  3. Select 1:Numerical derivative at a point and press ENTER
  4. An entry screen opens where you can select the name of the independent variable (default is x, not X), the point where you want the derivative and whether you calculate the first or the second derivative.
  5. After you make your choices, you press ENTER and a template is displayed in calculator screen.
  6. All you have to do then is to specify the function you are differentiating.
Here are a few screen captures to illustrate the process.




For the numerical integration
Select Calculus (see above)>Numerical Integration>ENTER.
Type in your integral using the template. Here is the procedure illustrated.



May 28, 2010 | Texas Instruments TI-Nspire Graphic...

1 Answer

TI 89 when solving equations or integrating a message appears:

With the ALPHA keyboard, Type in the NewProb command and press ]ENTER] It resets the one-letter variables to their default status.
Alternatively, you can use the CATALOG of commands to launch the NewProb command.
Another way is
In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].
If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

Apr 14, 2010 | Texas Instruments TI-89 Calculator

1 Answer

How do i calculate limits on my Casio fx-115es? Ex. lim x->3 for (x2'-0)/x-3

Sorry, but you cannot calculate limits of functions with this calculator. It does not have a Computer `Algebra System (CAS). For that you need a graphing calculator with CAS: Casio ClassPad 300, 300PLUS, 330, HP 48 GII, HP49 G/ G+, HP 50G, TI-NSPIRE CAS, TI89 Titanium, TI 92/92PLUS, TI Voyage 200 PLT. It is still a very good scientific (non graphing) calculator
However, you can calculate numerical derivatives, and numerical integrals, solve linear and non-linear equations.

Even though this post does meet your expectations, do not let that prevent you from rating it.

Jan 21, 2010 | Casio FX-115ES Scientific Calculator

2 Answers

Can i calculate calculus using fx-991ms

If you want to get an answer like 1/2X for d/dx(X^2), you will have to purchase a CAS calculator like Casio's Algebra FX-2 or Classpad. TI series calculators also have CAS.
However, you can calculate the numerical values of derivatives and integrals only.
To calculate the value of a proper integral:

  1. Press the 'ON' key;
  2. Press the Integral key b8325f5.jpg;
  3. Enter your expression (example X^2+X-3 etc);
  4. Press the 'comma' key after your expression;
  5. Input the first limit after comma, input comma again after first limit;
  6. Close brackets;
  7. Press the equals key, display may return after a while with the answer.
for eg to calculate xdx from 0 to 2, input as follows:


To calculate derivative at a point:

  1. Press Shift and then the integration key.
  2. Enter your function;
  3. Input comma;
  4. input the point at which you want to evaluate the derivative;
  5. Close bracket and press enter.
Example, to calculate d/dx X^2 at 3 input:

SHIFT+dx key X^2,3)

Display looks like this: d/dx(X^2,3).

Oct 23, 2009 | Casio FX-300MS Calculator

1 Answer

Differentiating and Integrating Problems

This means that you are using a non-algebraic variable in an expression. I know, I am not even paraphrasing. Exemple: if you write 2 + johnQ, where johnQ is a table of data, a picture or a GDB, graphical data base object.

8d787a6.jpg Here is an exemple where mat is a 2X2 matrix and mot is a table.
Hope it helps.

Sep 14, 2009 | Texas Instruments TI-89 Calculator

1 Answer

How to find general anti-derivative Problems in Casio fx-115ES... I get the message syntax error, and also when the anti-derivative is bounded I get my answers in decimal form, i dont want decimal form......


I assume that by anti-derivative you mean the integral. I believe that you can only calculate definite integrals with this calculator. A definite integral requires that you specify the function e.g ln(x), the variable, x, the numerical value of the lower limit, 0.5 and the numerical value of the upper limit , say 2.
Try this: INT(sin(x),x, 0, pi/2)
This calculator can only give numerical values of definite integrals. If you want to perform symbolic calculations, you shoul look towards some other, more sophisticated Casios Casio ClassPad 330, or the TI Voyage200PLT, or the TI89Titanium. etc.

Hope it helps

Aug 28, 2009 | Casio FX-115ES Scientific Calculator

4 Answers


On the home screen, go to F6 ([2nd] [F1]) and then press [2] (NewProb). It should fix the problem.

Feb 15, 2007 | Texas Instruments TI-89 Calculator

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