Expression 4: 2 times "S" left parenthesis, .5 plus .5 "x" , right parenthesis minus 1 left brace, abs left parenthesis, "x" , right parenthesis less than or equal to 1 , right brace2·S.5+.5x−1absx≤1
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Expression 5: signum left parenthesis, "x" , right parenthesis times "S" left parenthesis, "x" , right parenthesis left brace, abs left parenthesis, "x" , right parenthesis less than or equal to 1 , right bracesignx·Sxabsx≤1
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Expression 6: StartFraction, tanh left parenthesis, "n" "x" , right parenthesis Over tanh left parenthesis, "n" , right parenthesis , EndFraction left brace, abs left parenthesis, "x" , right parenthesis less than or equal to 1 , right bracetanhnxtanhnabsx≤1
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Expression 7: "S" left parenthesis, "x" , right parenthesis equals 3 "x" squared minus 2absolute value left parenthesis, "x" , right parenthesis cubedSx=3x2−2absx3