Detail solution
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Apply the power rule: goes to
The answer is:
The first derivative
[src]
$$- \frac{4}{5 x^{\frac{9}{5}}}$$
The second derivative
[src]
$$\frac{36}{25 x^{\frac{14}{5}}}$$
The third derivative
[src]
-504
---------
19/5
125*x
$$- \frac{504}{125 x^{\frac{19}{5}}}$$