Expression 2: "y" equals negative 5 left brace, 0 less than "x" less than or equal to 2 pi , right bracey=−50<x≤2π
2
Expression 3: negative StartFraction, 20 Over pi , EndFraction sine left parenthesis, StartFraction, "x" Over 2 , EndFraction , right parenthesis left brace, negative 2 pi less than or equal to "x" less than or equal to 2 pi , right brace−20πsinx2−2π≤x≤2π
3
Expression 4: negative StartFraction, 20 Over pi , EndFraction sine left parenthesis, StartFraction, "x" Over 2 , EndFraction , right parenthesis minus StartFraction, 20 Over 3 pi , EndFraction sine left parenthesis, StartFraction, 3 "x" Over 2 , EndFraction , right parenthesis left brace, negative 2 pi less than or equal to "x" less than or equal to 2 pi , right brace−20πsinx2−203πsin3x2−2π≤x≤2π