[RPET 2001; Kurukshetra CEE 2002]
A) 0
B) 1
C) -1
D) Not defined
Correct Answer: A
$ f(x)=|x{{|}^{3}} $
Therefore $ {f}’(x)=3|x{{|}^{2}}\frac{d}{dx}|x| $
At $ x=0 $ , $ {f}’(x)=0.\frac{d}{dx}|x| $ , $ {f}’(x)=0 $ .
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