Find the first and second derivative of the function.

$G(r)=\sqrt[\phantom{2}]{r}+\sqrt[8]{r}$

$G^{\text{'}}(r)=\frac{1}{2\sqrt[\phantom{2}]{r}}+\frac{1}{8\sqrt[8]{r^7}}$

$G^{\text{'}\text{'}}(r)=$

$$

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