Expression 2: "y" equals 1 minus StartFraction, "x" Over 1 , EndFraction squared plus StartFraction, 12 Over 4 ! , EndFraction "x" to the 4th power minus StartFraction, 120 "x" to the 6th power Over 6 ! , EndFraction plus StartFraction, 1680 "x" to the 8th power Over 8 ! , EndFraction minus StartFraction, 30240 "x" to the 10th power Over 10 ! , EndFraction plus StartFraction, 665280 "x" to the 12th power Over 12 ! , EndFraction minus StartFraction, 17297280 "x" to the 14th power Over 14 ! , EndFraction plus StartFraction, 518918400 "x" to the 16th power Over 16 ! , EndFraction minus StartFraction, 17643225600 "x" to the 18th power Over 18 ! , EndFraction plus StartFraction, 670442572800 "x" to the 20th power Over 20 ! , EndFraction Has graph. To audio trace, press ALT+T.y=1−x12+124!x4−120x66!+1680x88!−30240x1010!+665280x1212!−17297280x1414!+518918400x1616!−17643225600x1818!+670442572800x2020!