Question about Texas Instruments TI-84 Plus Calculator

# Integration with limits & with out limits

Hii i have the model CASIO fx- 991 ES & in that
1. I need to perform the integration. say for example integration of log(X), For this if i don't want to specify the limits then how should i give the expression because without specifying the limits it is giving syntax error.

2. The second one is if i need to specify the limit as 0 to infinity or -infinity to infinity then how could it be possible in this model?

Looking forward for the positive reply.

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• Texas Instru... Master

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

Posted on Sep 06, 2009

• k24674 Sep 06, 2009

As to representing infinity, no way can you do that on this calculator. Only CAS calculators can manipulate infinity.

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Dx/(1-sin(x)+cos(x))

Posted on Mar 02, 2009

Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
Goodluck!

Posted on Jan 02, 2017

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