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![\includegraphics[height=10mm]{images/cos-1}% WIDTH=48 HEIGHT=45](img114.png)
Produces an arc cosine function of the input,
or the inverse of the cosine function.
The operator can be placed on the canvas in two ways:
- From the Functions (``function'') toolbar; or
- By typing the letters ``acos'' on the canvas and then pressing the
Enter key.
For further explanation regarding trigonemtric functions, see Wikipedia's page on trigonometric functions.