Question about Texas Instruments TI-89 Calculator

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Integration problems When I try to integrate an expression such as x^2sin(x), I enter it like (x^2*sin(x),x) But then I get an answer in a matrix form, that looks something like [6.043 -15.2842 ....... ] 113.655 ...... -62.7001 ...... Please help me to know what's going on, I was working earlier with matrices and I'm not sure if I hit something that messed it up. Any help would be greatly appreciated!

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  • Anonymous Nov 30, 2008

    when I try to integrate, I am getting the answer interms of Matrix.


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This happened to me. Format the calculator and it will work properly. I forgot how to format the calculator , but if i`m not mistaken , press left + right + ON + green.

Posted on Sep 06, 2008

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The integral cannot be calculated in terms of the elementary functions. It is given by dilogarithm Li_2. Note here that log stands for the natural logarithm (ln)


Jan 01, 2014 | Texas Instruments TI-89 Calculator

2 Answers

Evaluating a problem using integration with sin x and cos x

4/sqroot2 is the same value as 2sqroot2, about 2.828 . It's just a matter of how the calculator and the textbook chooses to represent the value.

Dec 30, 2012 | Office Equipment & Supplies

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When i do my integration problems i am getting my answers in decimal form. for example {S((lnx),x,1) = 0.}

What are you trying to do? The syntax you use depend on what you want to achieve.
Indefinite integral : Integral( ln(x),x) gives the correct answer xln(x)-x
Definite integral : Integral(ln(x),x,1,2) gives the integral of ln(x) between x=1 and x=2
Definite integral between 1 and y : Integral (ln(x), x,1,y) gives the correct expression yln(y)-y +1

By inserting the =0 you are in fact assigning the result of the integration to value 0, and the calculator calculates the integral and assigns 0 to it. This is what my TIVoyage 200 PLT gives me:
{Integral((lnx),x,1) = 0.} returns {x.ln(x)-x+1=0}
which is an equation.

Apr 17, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I am trying to get the answer to an indefinite integral. I keep getting "argument error" For example, I type in after the integral sign: (sin(x),x) and get the error message. Help!

You already have something stored with the name x. Either get rid of it or use a different name for the variable of integration.

You can see what variables you have stored by pressing 2ND [VAR-LINK] (the minus key).

Feb 02, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How to calculate a finite integral

Press 2ND MATH to bring up the Math menu. Select "Calculus" and then "integrate." Enter the expression, the variable of integration, the lower limit, and the upper limit, separated by commas. Close the final paren and press ENTER or diamond ENTER.

For example, to calculate the integral from 0 to pi of sin(x) dx, you want


where INT is the integral sign and pi is the lower-case Greek pi.

Sep 22, 2010 | Texas Instruments TI-89 Calculator

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I am trying to type in x^4-2sin^2(x) on my ti-83 plus. Unfortunately, it will not let me put the ^2 directly after the sin

The calculator treats sin(x) as a single unit. You have to enter it as "sin(x)^2". Be careful you don't enter it as "sin(x^2)", which is "sine of x^2". If you want to be sure, you can put in an extra set of parens and go with "(sin(x))^2".

Exponentiation of trig functions is a funny bit of notation. Rarely does the exponentiation operator go into the middle of an expression.

Sep 10, 2010 | Texas Instruments TI-83 Plus 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

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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

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Need symbolic instead of numeric answer for integration

Clear all variables [F6] [ENTER]
Here is a screen capture of the display for your integral.

Hope it helps

Dec 27, 2008 | Texas Instruments TI-89 Calculator

2 Answers

Integration with limits & with out limits

This calculator can only perform NUMERICAL DEFINITE integrals. Which meansyou have to supply the numerical value of the lower limit and the numerical value of the upper limit. The result is a numerical value.
The calculator cannot perform symbolic calculus.

If the function is simple you find the integral in tables of integrals where you will see that INT(log(X)dx=x(log(x)+1). Some calculators that have a CAS (computer algebra system) can manipulate symbolic expression, but not theCasio FX-991ES.

You ask it the value of the integral of log(X) from X=1 to X=3 and it will give you 0.5627748004

Hope it helps

Dec 12, 2008 | Texas Instruments TI-84 Plus Calculator

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