How can I prove that g (x,y)=3x(y^3) is differenti...

Answers ( 1 )

  1. julia williams
    julia williams
    then
    Let
    then
                 
                 
                        
                   
    where
    and  
    Clearly and   ------>0 as
    Hence from the definition of differentiability f(x,y) isdifferentiable everywhere in

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