MCQ
$\frac{d}{{dx}}x\left| x \right| = .......\left( {x < 0} \right)$
- A$2x$
- ✓$-2x$
- C$2\left| x \right|$
- D$0$
$\frac{d}{{dx}}x\left| x \right| = \frac{d}{{dx}}x\left( { - x} \right)$ $\because \left( {x < 0 \Rightarrow \left| x \right| = - x} \right)$
$ = - \frac{d}{{dx}}{x^2}$
$ = - 2x$
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