approx erf(x) | Desmos

Expression 8: hyperbolic tangent left parenthesis, "k" "x" , right parenthesis

8

better fit, less inversible ( solve P3 )

9

Expression 10: error function left parenthesis, "X" , right parenthesis tilde hyperbolic tangent left parenthesis, "a" "X" plus "c" "X" cubed , right parenthesis

10

Expression 11: hyperbolic tangent left parenthesis, "a" "x" plus "c" "x" cubed , right parenthesis

11

GUI

12

Expression 17:

17

18

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