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Need symbolic instead of numeric answer for integration

When i integrate the function given by the guidebook, x*sin(x), it gives me the answer as -2572.13 instead of sin(x) - x*cos(x). I type it in as (integrate symbol)(x*sin(x),x). No limits, so it really shouldnt be able to express it numerically. Any ideas?

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  • SkylineNXS
    SkylineNXS Dec 27, 2008

    I found the answer myself actually. If anyone wants to know, if there is a value stored in the variable you are using to integrate, it will produce an undesirable answer.

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Hello,
Clear all variables [F6] [ENTER]
Here is a screen capture of the display for your integral.
Need symbolic instead of numeric answer for integr - cbddc77.jpg

Hope it helps

Posted on Sep 13, 2009

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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 | Calculators

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Is it possible to find out integral in TI-83 Plus?


Yes, if you want a numerical answer. Use the fnInt() function in the MATH menu.

No, if you want a symbolic answer.

Mar 18, 2011 | Texas Instruments TI-89 Calculator

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The trigonometric functions don't give solutions. Example: sin(5) returns sin(5) instead of 0.087 . go can i fix this?


Press diamond then ENTER to convert a symbolic result to numeric. To have all results come out in symbolic form, press MODE to bring up the mode screen. Press F2 to get to the second page. Use the arrow keys to move down to the "Exact/Approx" line, press right-arrow, and select "APPROXIMATE". Press ENTER to save the change.

Feb 09, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How to integrate xsinx between -1 and 2 on ti-nspire


mib8888_10.gif

To do this on the TI NSpire:
  1. Press [HOME] [1]
  2. Press [CATALOG] [1] [I] and scroll down until the integral symbol or integral( function is located. Press [ENTER] on either function.
  3. Input: x sin x, x, -1, 3
  4. Press [ENTER].

Jan 23, 2011 | Texas Instruments TI-Nspire Graphic...

3 Answers

TI89 is giving wrong answer for the integral of sec(x). Please help. It gives the answer as: ln[ |cos(x) / (sin(x)-1)| ] when it should be ln[ |(sin(x)-1) / cos(x)| ]. Why is it giving the wrong...


Hi danagasta,

If my last instructions did not work then you need to reset your RAM. You are missing the negative sign and, I have no idea where you got the absolute value inside the brackets.
Yes, the absolute value are used in books and, on integral tables but, I can asure you that the Ti 89 should not have produce them in this answer.

I'll stand behind that In( -cos(x) / (sin(x)-1)) is the correct answer. You can go ahead and simplify after the calculation to get the answer you want but, that is the good answer that Ti 89 is going to give you for the integral of sec(x).

Errors that do not match the suspected, I am pretty sure that Texas Instruments would have you clear the RAM. I do not like resetting the RAM but, I could not find the cause to why you got the answer you did. And so far no other expert has produced a solution to convince me otherwise.

I was not able to come up with any of the 3 answers MiB8888 did on my Ti 89. I am not saying that they are not good answers, they are book and integral tables answers. You are not going to get them on the Ti 89.

Jan 04, 2011 | Texas Instruments TI-89 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

Does this calculator perform integrals or derivatives?


Yes. Look in the calculus menu (2nd [CALC]). You'll find nDer, der1, and der2 for numerical differentiation and fnInt for numerical integration.

You'll find full details on these functions in the "Math, Calculus, and Test Operations" chapter of your guidebook. If you need a new guidebook, you can download it from http://www.education.ti.com

May 30, 2010 | Texas Instruments TI-86 Calculator

1 Answer

Integral of sinx how to calculte in casio fx991 es


Hello,
Configure the calculator to be in MathIO : [SHIFT][MODE][1:MathIO].
Press the Integral key, the one judt beloe the [ALPHA] key.
The template of the integral appears, with the cursor in larger rectangle. Enter the function the screen displays the integral, a small upper sqaure, and a small lower square. The left parenthesis of the function is already supplied by the calculator.
Press [ALPHA] X to enter the argument of the function.
Press the right parenthesis.
Remain the limits.
Use left arrow to move the cursor just before the s of sin and press down arrow to enter a numerical value for the lower limit.
Press the up arrow to move cursor in upper square.
Key in the numerical value of the upper limit.
Press [=].

Warning. To have meaningful result, make sure the angle unit used is conform to the problem you are trying to solve.

Hope it helps.

Nov 01, 2009 | Casio FX-300MS 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......


Hello,

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

2 Answers

Integration with limits & with out limits


Hello,
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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