question_answer

Let S be the set of points where the function, \[f(x)=\left| 2-\left| x-3 \right| \right|,x\in R\], is not differentiable. Then \[\sum\limits_{x\in S}{f(f(x))}\] is equal to_____.                                       [JEE MAIN Held on 07-01-2020 Morning]

Answer:

03