FCS of sine with Sigma | Desmos

Expression 2: "y" equals StartFraction, 8 Over pi , EndFraction Start sum from "k" equals 1 to "k" Subscript, "m" "a" "x" , Baseline , end sum, StartFraction, "k" Over left parenthesis, 4 "k" squared minus 1 , right parenthesis , EndFraction sine left parenthesis, 2 "k" "x" , right parenthesis

2

Expression 3: "k" Subscript, "m" "a" "x" , Baseline equals 9

1

20

3

4

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