5x^2 y
------ , (x,y) ≠(0,0)
x^3+y^3
let f(x,y){
0 , (x,y) = (0,0)
prove that
a. f (0,0) exists ,and
x
b. fis not differentiable at (0.0)
有請大大 謝謝
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cc
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