approx erf(x) | Desmos

Expression 4: 1 minus StartFraction, left parenthesis, 1 minus "e" Superscript, negative 1.9 8 "x" , Baseline , right parenthesis "e" Superscript, negative "x" squared , Baseline Over 1.1 3 5 StartRoot, pi , EndRoot "x" , EndFraction

4

Expression 5: StartRoot, 1 minus "e" Superscript, negative StartFraction, 4 Over pi , EndFraction "x" squared , Baseline , EndRoot left brace, "x" greater than or equal to 0 , right brace

5

Expression 6: StartRoot, 1 minus "e" Superscript, negative "x" squared , Baseline , EndRoot less than or equal to "y" less than or equal to StartRoot, 1 minus "e" Superscript, negative StartFraction, 4 Over pi , EndFraction "x" squared , Baseline , EndRoot left brace, "x" greater than or equal to 0 , right brace

6

Expression 7: hyperbolic tangent left parenthesis, 1.1 5 "x" , right parenthesis

7

8

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