Expression 1: "f" left parenthesis, "x" , right parenthesis equals Start sum from "n" equals 1 to 15, end sum, StartFraction, sin left parenthesis, "n" "x" , right parenthesis Over "n" , EndFraction Has graph. To audio trace, press ALT+T.fx=15∑n=1sinnxn
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Expression 2: StartFraction, left parenthesis, "f" left parenthesis, negative tau "x" , right parenthesis plus 2 , right parenthesis Over 4 , EndFraction Has graph. To audio trace, press ALT+T.f−τx+24