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What are the shapes of the function of 3rd order curve?


Dear friends;

I want to know all the shapes of the function of
3rd order curves, for example,
y[x_]=a*x^3+b*x^2+c*x+d,
I want to know all the shapes of this function.

Thank you very much!

Liwen
e-mail: gzgear at yahoo.com




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