Fit data to a sinusoidal curve
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Hi! I have two plots with data, they both look like a part of sinusoid. I have to prove that the changes in these two plots start at the same time by fitting a sinusoid to them. And then I have to make sure that they have the same sinusoidal period.
I am attaching the picture. So the first and the third plots in blue color are the ones that have to be fitted to a sinusoid. You can see that both lines start to change at the same time - the meanings are getting smaller.
How can I do this?
Thank you!

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