Expression 3: "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals 2 ( negative "x" plus StartRoot, 1 plus "x" squared minus "x" cubed , EndRoot )f2x=2(−x+1+x2−x3)
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Expression 4: "t" left parenthesis, "x" , right parenthesis equals negative 2 "x" plus 2tx=−2x+2
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Expression 5: "n" left parenthesis, "x" , right parenthesis equals 0.5 "x" plus 2nx=0.5x+2