Consider f(x)=∣x−3∣+∣x+3∣f(x) = |x-3| + |x+3|f(x)=∣x−3∣+∣x+3∣. Where is f′(x)f'(x)f′(x) undefined?
Nowhere
x=0x=0x=0
x=3,x=−3x=3, x=-3x=3,x=−3
x=3x=3x=3 only