Question about Texas Instruments TI-84 Plus Calculator

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Ti84 "Sin/Cosin/Tan" Problem...

Not quite sure whats going on...

Heres what happens

I hit the Sin button, enter in the degrees "sin(30)" for example. Instead of .5000, which is what the sine of 30 actually is, it comes up as -.9880316241

I cleared all my memory/ram etc and same problem.


Any help?

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  • jupy Nov 21, 2008

    My Sin button does not work on my TI-84 Plus. Any suggestions?

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  • 32 Answers

The problem is that you have the mode in radians. You want them in degrees. This is a simple fix. Press mode and then go down to radians and select degrees

Posted on Dec 04, 2008

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How do i work out the Sin, Cos, and Tan on the TI-83 plus?


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