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Wildan Bagus W

Mohon bantuannya

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Carilah semua fungsi $f:\mathbb{R} \to \mathbb{R}$ yang memenuhi hubungan rekursif

\[f(f(x)+y)=f(x^2-y)+4f(x) \cdot y\]

untuk semua bilangan real $x$, $y \in \mathbb{R}$.

Edited by Wildan Bagus W

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