Question

If $f(x)=x\cdot |x|$, then its derivative is :

• A. $2x$
• B. $-2x$
• C. $2|x|$
• D. $2x\mathrm{sgn}x$

Answer 1

Answer: (C), (D)

Correct answer is (c) $2|x|$ Correct answer is (d) $2x\mathrm{sgn}x$