If $f(x)=\sum_{n \ge 0} a_n x^n $ then, can we write $ \sum_ {n \ge 0} (a_n)^2 x^n$ in terms of $f(x)$ ?
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If $f(x)=\sum_{n \ge 0} a_n x^n $ then, can we write $ \sum_ {n \ge 0} (a_n)^2 x^n$ in terms of $f(x)$ ?
