Expression 2: StartFraction, 1 Over 100 , EndFraction Start sum from "n" equals 3 to 10, end sum, StartFraction, 1 Over "n" Superscript, "k" , Baseline , EndFraction sine left parenthesis, 2 pi times 55 times "n" times "x" plus "a" , right parenthesis Has graph. To audio trace, press ALT+T.110010∑n=31nksin2π·55·n·x+a