Expression 5: "y" Subscript, "u" , Baseline left parenthesis, "x" , right parenthesis equals StartFraction, 1 plus tanh left parenthesis, "x" , right parenthesis Superscript, StartNestedFraction, 1 NestedOver 2 "n" minus 1 , EndNestedFraction , Baseline Over 2 , EndFractionyux=1+tanhx12n−12
5
Expression 6: "y" Subscript, "E" "R" "R" , Baseline equals arc tangent left parenthesis, StartFraction, 1 Over "y" Subscript, "u" , Baseline left parenthesis, "x" , right parenthesis minus "u" left parenthesis, "x" , right parenthesis , EndFraction , right parenthesisyERR=arctan1yux−ux