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Let f(x)=a+b|x|+c|x|^4 , where a ,\ b , ...

Let `f(x)=a+b|x|+c|x|^4` , where `a ,\ b ,` and `c` are real constants. Then, `f(x)` is differentiable at `x=0` , if `a=0` (b) `b=0` (c) `c=0` (d) none of these

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