need help...is the func. diff at x=0 or not?

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- Apr 22nd 2009, 02:37 AMadhyetacheck differentiability
need help...is the func. diff at x=0 or not?

- Apr 22nd 2009, 03:19 AMmr fantastic
- Apr 22nd 2009, 03:23 AMchisigma
If you compute the derivative of in as...

... for and is...

... no matter which is the sign of . So is differentiable in ...

Kind regards