If \( f(x) \) is differentiable everywhere, then (1) \( |\mathrm{f}| \) is differentiable everyw...

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If \( f(x) \) is differentiable everywhere, then
(1) \( |\mathrm{f}| \) is differentiable everywhere
(2) \( |\mathrm{f}|^{2} \) is differentiable everywhere
P
(3) \( f|f| \) is not differentiable at some point
W
(4) \( f+|f| \) is differentiable everywhere
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