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Mathematica

How do I write this function in Mathematica?

Ulf Karlsson, private person
Posted 6 years ago
POSTED BY: Ulf Karlsson
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POSTED BY: Ulf Karlsson
Ehud Behar
Ehud Behar
Posted 6 years ago
POSTED BY: Ehud Behar

I would do it this way:

f[x_] := (x + 3)^2;
f[f[x]]

Beware the difference between square brackets and round parentheses, and between the pattern x_ and the variable x.
POSTED BY: Gianluca Gorni

Thanks!

//Ulf
POSTED BY: Ulf Karlsson
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