Expression 3: "g" left parenthesis, "n" , "x" , right parenthesis equals "x" minus sine left parenthesis, "g" left parenthesis, "n" minus 1 , "x" , right parenthesis , right parenthesisgn,x=x−singn−1,x
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Expression 4: "y" equals "x" minus StartRoot, 2 , EndRoot "g" left parenthesis, "k" , StartRoot, 2 , EndRoot "x" , right parenthesisy=x−2gk,2x