The sum of digits of the 5th derivative of f(x)=x/(1-x^4)

Dear Student,

$$\begin{gathered} "\mathrm{Sum} \mathrm{of} \mathrm{the} \mathrm{digits}" \mathrm{is} \mathrm{not} \mathrm{clear} \mathrm{here}. \mathrm{We} \mathrm{are} \mathrm{not} \mathrm{able} \mathrm{to} \mathrm{understand} \mathrm{the} \\ \mathrm{problem} \mathrm{clearly}. \mathrm{Please} \mathrm{be} \mathrm{more} \mathrm{specific} \mathrm{so} \mathrm{that} \mathrm{we} \mathrm{can} \mathrm{provide} \mathrm{you} \mathrm{meaningful} \\ \mathrm{help}. \end{gathered}$$





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