Given the functions : (a) f(x)=|x| and ...

Given the functions :
`(a) f(x)=|x|` and
(b) `phi(x)=|x^(3)|`
Do derivaties for these functions exist at the point x=0

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Given the functions :`(a) f(x)=|x|` and (b) `phi(x)=|x^(3)|` Do derivaties for these functions exist at the point x=0