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lovi 
the {1,2,3,...} is an array constant. the ^ is the "raise to a power" operator. So this part raises the array of known_x's to each of those powers, resulting in an nx6 matrix that LINEST() uses to find the coefficients of a 6th order polynomial.
the {1,2,3,...} is an array constant. the ^ is the "raise to a power" operator. So this part raises the array of known_x's to each of those powers, resulting in an nx6 matrix that LINEST() uses to find the coefficients of a 6th order polynomial.
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