It f(x)=x2−4x|+3| then A={x:f is not differentiable at x} is equal to

It $f (x) = |x^{2} - 4| x | + 3 |$ then $A = {x : f$ is not differentiable at x} is equal to

$f (x) = | (| x | - 1) (| x | - 3) |$ Hence $f$ is not differentiable at $| x | = 1, | x | = 3 i.e. at x = 1, - 1, 3, - 3$

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