Medium
Find the derivative of $x^{-4}(3-4x^{-5})$.
- A$-12x^{-5} + 36x^{-10}$
- B$12x^{-5} - 36x^{-10}$
- C$-12x^{-5} - 36x^{-10}$
- D$12x^{-5} + 36x^{-10}$
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