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![\includegraphics[height=10mm]{images/tan-1}% WIDTH=48 HEIGHT=45](img115.png)
Produces an arc tangent function of the input,
or the inverse of the tangent function.
The operator can be placed on the canvas in two ways:
- From the Functions (``function'') toolbar; or
- By typing the letters ``atan'' on the canvas and then pressing the
Enter key.
For further explanation regarding trigonemtric functions, see Wikipedia's page on trigonometric functions.