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Let f(x)=[x e^x\ \ \ \ \ \ \ \ \ \ \ \ \...

Let `f(x)=[x e^x\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ xlt=0x+x^2-x^3\ \ \ \ \ \ x >0` then prove that `f` is continuous and differentiable for all `xdot` `f'` is continuous and differentiable for all `xdot`

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