表达式8: hyperbolic tangent left parenthesis, "k" "x" , right parenthesistanhkx
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better fit, less inversible ( solve P3 )
对学生隐藏该文件夹。
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表达式10: error function left parenthesis, "X" , right parenthesis tilde hyperbolic tangent left parenthesis, "a" "X" plus "c" "X" cubed , right parenthesiserfX~tanhaX+cX3
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表达式11: hyperbolic tangent left parenthesis, "a" "x" plus "c" "x" cubed , right parenthesistanhax+cx3