Fourier cosine series with coefficients 1/n^2 | Desmos

Expression 1: Start sum from "n" equals 1 to 100, end sum, StartFraction, cos left parenthesis, "n" "x" , right parenthesis Over "n" squared , EndFraction

1

Expression 2: StartFraction, left parenthesis, "x" minus pi , right parenthesis squared Over 4 , EndFraction minus StartFraction, pi squared Over 12 , EndFraction

2

3

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