Number of critical points of $f(x) =\frac{|x^2-1|}{x^2}$ is
Answer & explanation
Correct answer: option 3
Clearly f(x) is not differentiable at x = 1 and x = -1 (x = 0 is not a critical point as it is not in the domain). Therefore 1 and -1 are critical points.
Hence (C) is the correct answer.