Expression 2: "b" left parenthesis, "x" , right parenthesis equals Start sum from "n" equals 0 to "N" minus 1, end sum, StartFraction, 1 Over 3 Superscript, "n" , Baseline , EndFraction sine left parenthesis, 4 Superscript, "n" , Baseline "x" plus StartFraction, 2 pi Over 3 , EndFraction mod left parenthesis, floor left parenthesis, StartFraction, left bracket, 0...3 Superscript, "N" , Baseline , right bracket Over 3 Superscript, "n" , Baseline , EndFraction , right parenthesis , 3 , right parenthesis , right parenthesis Has graph. To audio trace, press ALT+T.bx=N−1∑n=013nsin4nx+2π3modfloor0...3N3n,3
2
Expression 3: absolute value left parenthesis, "y" minus "b" left parenthesis, "x" , right parenthesis , right parenthesis less than or equal to .0 1absy−bx≤.01