Polynomial equation

Hi all,

I have got a dataset. In Excel, I can fit a polynomial trend line
beautifully. However, the equation that Excel calculates appear to be
incorrect. So I am thinking about using R.

My questions are:
(1) How do I fit a polynomial trendline to a graph?
(2) How do I calculate and display the equation for that trendline?

Many thanks for your help. Greatly appreciated.

Chris

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