MCQ
$
\frac{d}{d x}\left(x-\frac{1}{x}\right)^2=
$ ____________ .
- A$2\left(x-\frac{1}{x}\right)$
- B$2 x-\frac{1}{x^2}$
- C$2 x+\frac{2}{x^3}$
- ✓$2 x-\frac{2}{x^3}$
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