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February 2nd, 2012, 07:14 PM  #1 
Joined: Feb 2012 Posts: 2 Thanks: 0  TI84 Plus Silver Edition
Hello, I am new member. May I ask a question? I have a TI84 Plus silver calculator. My math teacher reset my calculator before taking exam. When I brought home, the function of SIN, COS, TAN are mixed up. For example, when compute TAN(45) , it came out wrong value 1.645, it should be 1. It is the same when I computed SIN and COS. I need help this problem if anyone knows this. Thanks CN 
February 2nd, 2012, 07:42 PM  #2 
Global Moderator Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,069 Thanks: 396 Math Focus: The calculus  Re: TI84 Plus Silver Edition
Hello, superway, Of course you may ask a question, that's what a forum is all about! The default mode for angles is radians, and when your calculator was reset that was the angle mode it defaulted to. You should have a mode key, which when pressed will allow you to change angles back to degrees. I'm not sure of the exact way to do this on your calculator, but on my TI89 Titanium, I press the mode key, then go down to angle and hit enter then choose between radians and degrees. If yours is substantially different, consult your user's manual for the correct procedure to change the angle mode. 
February 2nd, 2012, 07:54 PM  #3 
Joined: Feb 2012 Posts: 2 Thanks: 0  Re: TI84 Plus Silver Edition
Thanks MarkFL, It works.

February 2nd, 2012, 08:00 PM  #4 
Global Moderator Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,069 Thanks: 396 Math Focus: The calculus  Re: TI84 Plus Silver Edition
Glad to hear it! I'm just curious, does your teacher allow you to upload your programs, etc. to a computer before resetting your calculator? I know when I was a student, I would have been very aggravated to lose all my programs and data. 

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