Derivada de y=cbrt(x^4)

  3 _____ /            3*|x|\
4*\/ |x| *|4*sign(x) - -----|
          \              x  /
-----------------------------
             9*x             

$$\frac{4 \left(4 \operatorname{sign}{\left(x \right)} - \frac{3 \left|{x}\right|}{x}\right) \sqrt[3]{\left|{x}\right|}}{9 x}$$

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  /      2           4/3                                 3 _____        \
  |2*sign (x)   9*|x|         3 _____                 12*\/ |x| *sign(x)|
8*|---------- + -------- + 12*\/ |x| *DiracDelta(x) - ------------------|
  |     2/3         2                                         x         |
  \  |x|           x                                                    /
-------------------------------------------------------------------------
                                   27*x                                  

$$\frac{8 \left(12 \sqrt[3]{\left|{x}\right|} \delta\left(x\right) + \frac{2 \operatorname{sign}^{2}{\left(x \right)}}{\left|{x}\right|^{\frac{2}{3}}} - \frac{12 \sqrt[3]{\left|{x}\right|} \operatorname{sign}{\left(x \right)}}{x} + \frac{9 \left|{x}\right|^{\frac{4}{3}}}{x^{2}}\right)}{27 x}$$

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