Mathematics · 2019
JEE Main · 10 January 2019, Shift 2 · Q71
Let f:(-1,1) → R be a function defined by f(x)= max {-|x|,-√(1-x^2)}. If K be the set of all points at which f is not differentiable, then K has…
Let $\displaystyle f:(-1,1) \rightarrow \mathbf{R}$ be a function defined by
$$f(x)=\max \left\{-|x|,-\sqrt{1-x^2}\right\} \text {. If } \mathrm{K} \text { be }
$$
the set of all points at which $\displaystyle f$ is not differentiable, then K has exactly :
Official answer
(3)
three elements
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.