Math and Trignometric SERIESSUM Function

Description

The SERIESSUM function returns the sum of a power series. Many functions can be approximated by a power series expansion.

SERIESSUM (x, n, m, coefficients)

Argument	Description	Required/Optional
X	The input value to the power series.	Required
N	The initial power to which you want to raise x.	Required
M	The step by which to increase n for each term in the series.	Required
Coefficients	A set of coefficients by which each successive power of x is multiplied. The number of values in coefficients determines the number of terms in the power series.	Required

The sum of a power series is given by

$SERIESSUM (x, n, m, a) = a_1x^n+a_2x^{(n+m)}+a_3x^{(n+2m)}+...+a_jx^{(n+(j-1)m)}$

Where (a₁, a₂, a₃ … a_j) is the set of coefficients.
If any of the specified arguments is non-numeric, SERIESSUM returns #VALUE! error

Excel 2007, Excel 2010, Excel 2013, Excel 2016

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