Expression 1: "y" equals sine left parenthesis, 10 "x" , right parenthesis times sine left parenthesis, "x" , right parenthesis left brace, "x" less than 9.4 , right bracey=sin10x·sinxx<9.4
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Expression 2: "y" equals 0 left brace, "x" greater than or equal to 9.4 , right bracey=0x≥9.4