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Default Coefficients of trendline

I have data obtained as following:
X: x1 x2 x3 x4 x5
Y: y1 y2 y3 y4 y5
(Five X Y values)
From abovementioned data, chart is made and equation of trendline
displayed. Question here.
I want to get coefficients of that equation of trendline (Using VBA)
without displaying it on chart (obtain local maximum values intentionally).
For equation of degree of 4 is easy but for degree of 3, 2 I can not obtain
by VBA programming
It is thankful of you for your comment

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