Let $f(x)=x \sin(x)$. Then $|f|$ is ?
- Differentiable at $x=\pi$
- Differentiable at $x=0$
- Uniformily continious on $\mathbb{R}$
- Differentiable at $x=-\pi$
I think only 3 is correct. but how to prove it?
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2026-03-29 07:31:25.1774769485
Let $f(x)=x \sin(x)$. Then $|f|$ is?
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