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The turning point tool finds accurate turning points of y=f(x)
and x=f(y) functions and inequalities.
Select the turning point tool by
clicking the  button
on the graph tools tool bar, or by selecting the 'Turning point' command from
the 'Tools' menu. The turning point tool cursor: 
is then displayed on the graph view, and the turning
point tool dialog box is displayed. (See below:)
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Drag on the title bar at
the top of the turning point
tool dialog box to move it.
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Click the
cursor on the graph view near the turning
point point of a y=f(x) or x=f(y) function graph. (The active
spot on this cursor is the dot in the middle of the small square.)
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If the turning point is
found, a temporary dot is drawn on the graph view at the turning
point, and the 'x' and 'y' value of the point will be
displayed in the turning point tool
dialog box
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Click the 'Cancel'
button to stop using the turning
point tool.
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Plotting the turning points:
All points found by the turning point
tool are stored in memory. Click the 'Plot'
button to plot all of the stored points and clear the memory.
Click the 'Clear' button to erase the
point memory.
Note:
The turning point tool is capable of very
high accuracy, even if you don't click exactly on a turning
point. It uses the point you click on as an initial estimate only.
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