Expression 1: "y" equals sine "x" minus floor left parenthesis, sin "x" , right parenthesis left brace, "x" greater than or equal to 0 , right bracey=sinx−floorsinxx≥0
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Expression 2: "y" equals sine "x" negative ceiling left parenthesis, sin "x" , right parenthesis left brace, "x" less than 0 , right bracey=sinx−ceilsinxx<0