JEE Main 2020 (Online) 7th January Morning Slot | Limits, Continuity and Differentiability Question 181 | Mathematics

Let S be the set of points where the function, ƒ(x) = |2-|x-3||, x $$ \in $$ R is not differentiable. Then $$\sum\limits_{x \in S} {f(f(x))} $$ is equal to_____.

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