Mathematics · 2019
JEE Main · 9 April 2019, Shift 1 · Q71
Let f(x)=15-|x-10|; x ∈ R. Then the set of all values of x, at which the function, g(x)=f(f(x)) is not differentiable, is:
Let $\displaystyle f(x)=15-|x-10| ; x \in \mathbf{R}$. Then the set of all values of $\displaystyle x$, at which the function, $\displaystyle g(x)=f(f(x))$ is not differentiable, is :
Official answer
(3)
$\displaystyle \{5, 10, 15\}$
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.