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Which function is not differentiable at x = 0?
  1. f(x) = x²
  2. f(x) = |x|
  3. f(x) = sin(x)
  4. f(x) = eˣ
Explanation

  f(x) = |x| has a cusp at x = 0, making it non-differentiable there.

A function is differentiable at a point if its derivative exists at that point. 

The absolute value function, (f(x)=|x|), has a sharp corner at (x=0). 

Functions with sharp corners are not differentiable at those points.

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