My cos and sin buttons are not getting the correct answer, is there a setting that they may be switched to that would cause this? If so, how do I fix it?
Office Equipment & Supplies - Texas Instruments - TI-83 Plus Calculator
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Answers & Comments
Press MODE to bring up the mode screen. Use the arrow keys to move down to the third line. Highlight either "DEGREE" or "RADIAN" as desired and press ENTER. Press 2ND [QUIT] to exit the mode screen.