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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