Question about Texas Instruments TI-89 Calculator

# I don't know how to calculate an inverse of a module

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• Texas Instru... Master

Hello,
Check the link below to a program that you can implement on your calculator.
http://www.cartesionline.it/materiali/algebra_numb_theory.cfm

Hope it helps.

Posted on Sep 13, 2009

Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
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Goodluck!

Posted on Jan 02, 2017

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No, you don't need a new calculator. Yours simply has the angular mode set to grads. The inverse tangent of 1 is 50 grads, the inverse tangent of sqrt(3) is 66.6... grads.
To change the angular mode, press MODE one or more times until you get the display "Deg Rad Gra". Select the mode you want (from the results you're expecting, it's 1 for Deg).

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By 'log inverse', you presumably mean the inverse of the logarithm function. There are two logarithm functions on most scientific calculators. Firstly [ln], or natural logarithms, to the base e, where the inverse is e^x. Secondly [log], or logarithms to the base 10, where the inverse is 10^x.

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Anyway, the inverse of the logarithm in base 10 IS the power function with base 10.
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What I think you're calling the inverse function keys actually calculate arcsine, arccosine, and arctangent.

To calculate cosecant x, for example, use the relationship
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### Calculate inverse module

Hello,
The TI 89 cannot calculate the inverse modulo, but you can enter a program that can do that. I found a link to such program. Here it is.

http://www.cartesionline.it/materiali/algebra_numb_theory.cfm

Hope it helps.

Jan 14, 2009 | Texas Instruments TI-89 Calculator

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