The first derivative of $y=\frac{(x-1)(x^{2}-2x)}{x^{4}}$ with respect of x, is:

The first derivative of $y=\frac{(x-1)(x^{2}-2x)}{x^{4}}$ with respect of x, is:
1). $2x^{-2}+5x^{-3}-6x^{-4}$
2). $-x^{-2}+6x^{-3}-6x^{-4}$
3). $x^{-2}-6x^{-3}+6x^{-4}$
4). $x^{-2}+6x^{-3}-2x^{-4}$

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