Question about Texas Instruments TI-89 Calculator
Sorry but you are not been very clear.
Are you doing some kind of geometry or trying to use the inverse trigonometric functions such as arccos, arcsin, arctan?
If you are doing geometry you should specify what application you are using.
If it concerns the trigonometric functions, on the TI83/TI83Plus these functions are represented as cos^-1, sin^-1, tan^-1.
To access them you press the 2nd (orange/yellow) then cos, sin or tan.
A word of caution:When using any trigonometric function make sure your calculator is configured with the correct angle unit ( degree or radian) your problem calls for.
Hope it helps.
Posted on Aug 19, 2009
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Posted on Jan 02, 2017
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