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I do not understand where the dividing by 3 came from

\[\int\limits \psi^2 d \psi = \frac{\psi^3}{3}+C; \psi = \sinh(x) \implies \frac{\sinh^3(x)}{3}+C\]

that does not explain why we are dividing by 3

for:
\[n \in \mathbb{Z} \ne -1\]