Cho $f(x)$ thỏa mãn : $f(0)=0,f(x)\geq \left | sinx \right |,\forall x\in \mathbb{R}$. Chứng minh không tồn tại $f'(0)$
$f(0)=0,f(x)\geq \left | sinx \right |,\forall x\in \mathbb{R}$
Started By Rias Gremory, 14-03-2018 - 15:37
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Posted 14-03-2018 - 15:37
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