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Graphmatica help?

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Hi! I've been meaning to do a regression on the graphmatica, but I have NO IDEA how to do it.

I have a sine function of time against the height of the tide somewhere in Canada. It was a portofolio in 2005 and we got it now to do it as a exercise, well. I have noo idea how to do the regression... I have some data and I've made the graph but when I press curve fit I get a weird graph and it doesn't fit my dots, at all... PLEASE HELP??? :o

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