While the mouse cursor is over the plotting area the cursor changes to a cross hair. The current coordinates can be seen at the intersections with the coordinate axes and also in the status bar at the bottom of the main window.
You can trace a function's values more precisely by clicking onto or next to a graph. The selected function is shown in the status bar in the right column. The cross hair then will be caught and be colored in the same color as the graph. If the graph has the same color as the background color, the cross hair will have the inverted color of the background. When moving the mouse or pressing the keys Left or Right the cross hair will follow the function and you see the current x- and y-value. If the cross hair is close to y-axis, the root-value is shown in the statusbar. You can switch function with the Up and Down keys. A second click anywhere in the window or pressing any non-navigating key will leave this trace mode.
Note that tracing is only possible with explicitly given functions. The coordinates are always displayed according to a Cartesian system of coordinates. Neither non-single-point parametric functions nor functions given in polar coordinates can be traced in this way.
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