triangle-wave | Desmos

Expression 1: "y" equals StartFraction, pi Over 2 , EndFraction minus left parenthesis, StartFraction, 4 Over pi , EndFraction , right parenthesis Start sum from "n" equals 0 to "N" , end sum, StartFraction, 1 Over left parenthesis, 2 "n" plus 1 , right parenthesis squared , EndFraction times cosine left parenthesis, left parenthesis, 2 "n" plus 1 , right parenthesis "x" , right parenthesis

1

Expression 2: "N" equals 0

0

20

2

3

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