On a plotted line,
shows data labels for y values only for user given,
"selected" x values.
The 2 functions are: ax²+bx+c
(parabola) and d arctan(x)² ⁄
[e(x+1)].
Files involved:
P-fromPython (this one),
FromPython.php,
fromPython.py.
Shows the graphical results with selected labels.
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