I have an XY-chart with data points that are very near a sine wave.
I would like to fit a sine wave trendline to the chart, and also get
the amplitude and the period from the formula of the sine wave.

Or perhaps I should work the other way around? First determine the
parameters for the sine wave function and then create a second series
of data points to be plotted on the chart?

Any suggestions and (simple!) examples are welcome.

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Amedee Van Gasse