Expression 2: "y" equals 20.5 1 6sine left parenthesis, 2 pi 60 left parenthesis, "x" , right parenthesis , right parenthesis left brace, "y" greater than or equal to 0 , right brace left brace, "x" greater than or equal to 0 , right brace left brace, "x" less than 0.0 6 6 6 6 , right bracey=20.516sin2π60xy≥0x≥0x<0.06666
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Expression 3: "y" equals negative 20.5 1 6sine left parenthesis, 2 pi 60 left parenthesis, "x" , right parenthesis , right parenthesis left brace, "y" greater than or equal to 0 , right brace left brace, "x" greater than or equal to 0 , right brace left brace, "x" less than 0.0 6 6 6 6 , right bracey=−20.516sin2π60xy≥0x≥0x<0.06666