derivative of the function

neither do I ... do you mean

\(\displaystyle f(x) = (3x^2-x)^4 (x^3+4x)^3\)

???

if so, the product and chain rules are in order ...

\(\displaystyle f'(x) = (3x^2-x)^4 \cdot 3(x^3+4x)^2 \cdot (3x^2 + 4) + (x^3+4x)^3 \cdot 4(3x^2-x)^3 \cdot (6x-1)\)

to simplify, factor out common factors from both terms ...

\(\displaystyle f'(x) = (3x^2-x)^3(x^3+4x)^2[3(3x^2-x)(3x^2+4) + 4(x^3+4x)(6x-1)]\)

I'll leave the remaining algebra "clean-up" for you.
 
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