Let \( \mathrm{K} \) be the set of all real values of \( \mathrm{x} \) where the function. \( f(...

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Let \( \mathrm{K} \) be the set of all real values of \( \mathrm{x} \) where the function. \( f(x)=\sin |x|-|x|+2(x-\pi) \cos |x| \) is not differentiable. Then the set \( \mathrm{K} \) is equal to: [JEE Main-2019 (January)]
P
(1) \( \phi \) (en empty set)
(2) \( \{\pi\} \)
W
(3) \( \{0\} \)
(4) \( \{0, \pi\} \)
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