Let f(x)=∣x∣3f(x) = |x|^3f(x)=∣x∣3. Determine the values of xxx for which f′′(x)f''(x)f′′(x) exists.
All x∈Rx \in \mathbb{R}x∈R
x≠0x \neq 0x=0
x>0x > 0x>0
x∈∅x \in \emptysetx∈∅