Expression 3: "y" equals "x" positive hyperbolic tangent left parenthesis, 0 , right parenthesis times left parenthesis, 1 minus "x" , right parenthesis Has graph. To audio trace, press ALT+T.y=x+tanh0·1−x
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Expression 4: "y" equals "x" positive hyperbolic tangent left parenthesis, negative 0.5 , right parenthesis times "x" Has graph. To audio trace, press ALT+T.y=x+tanh−0.5·x
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Expression 5: "y" equals "x" positive hyperbolic tangent left parenthesis, negative infinity , right parenthesis times "x" Has graph. To audio trace, press ALT+T.y=x+tanh−∞·x