Hello, I can't find any way to prove if this funtion is or isn't differentiable in if :

if

if

Thank you!

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- Jan 18th 2010, 12:11 PMBopCheck differentiability in function
Hello, I can't find any way to prove if this funtion is or isn't differentiable in if :

if

if

Thank you! - Jan 18th 2010, 12:12 PMVonNemo19
- Jan 18th 2010, 12:14 PMGeneral
- Jan 18th 2010, 12:19 PMBop
Thanks for the answers!

I have calculated derivative respect x: , respect y: but then? - Jan 18th 2010, 12:25 PMBop
I have calculate that limit of doesn't exist.. How can I continue?