Let S be the set|Continuity and Differentiability|JEE MAIN

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JEE MAIN 2020

07-01-20 S1

Question

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

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