Question about Texas Instruments TI-86 Calculator

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My answer differs from the text book

How do i fix my answer if i set it in degree mode and it differs from the text book answer?

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Calculate it with another one and or talk to the teach!!

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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When i m finding tan inverse of (6.283/5) i m getting 57.20 while in book ans is 51.49 why is it so????


You have the angular mode set to grads while the book is working in degrees. To set your calculator to degrees, press SHIFT MODE 3.

Mar 05, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

Any sin, cos, or tan function problem always gives the incorrect answer. I can use my TI 55 that is 30 years old and get the correct answer, but my son's TI84 plus silver edition is incapable of giving the...


Make sure you have the proper angular mode set. The TI-84 can work with degrees or radians.

Press MODE to bring up the mode screen. Use the arrow keys to highlight either "Radian" or "Degree" on the third line and press ENTER. Press 2ND [QUIT] to exit the mode screen.

If this doesn't do it, please reply to this post giving an example of a calculation and the answer you're getting from the calculator.

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1 Answer

I want to complete normal calculations. the default says it is set at D for angles in degrees or something I just want to balance my check book and everytime I put in the calculations I get a fraction for...


OK,do not worry. Press [2nd][MODE] to access tghe (SETUP) options. Then press 2 to select [2:LineIO]. from now on all your results will be displayed as decimal numbers. Do not pay attention to the D for degrees, if you are not doing angle calculations or trigonometry.

Another point. Since you only want to balance the checkbook, all your numbers have at most 2 decimal digits and it might be less tiresome for you if you configure your calculator to display just 2 figures after the decimal mark.

To do that
  1. Press [2nd][MODE].
  2. Enter 6 to select [6:FIX].
  3. Then enter 2.

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Is there a way to turn of predictive text completely?


From Twitter by @handbooklive,

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SEtup t9 texting


When in Text mode, press the # button. With each press, you will see the 'Abc' on the screen changing. When you see the 'Abc' with a small book by it, then you are in T9 texting mode.

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here are the steps in changing it from radian to degrees
1. turn on your TI-83 plus
2. press the MODE button near the top of your calculator
3.go down to options and move the highlight from radian to degree, press enter and clear
you're good to go

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