Question: code class = asciimath > A 2 . Is f ( x , y ) = { ( ( x ^ ( 3 ) +

code class

=

"asciimath"

>

A

2 .

Is f

(

x

,

y

) = {((

x

^(3) +

xy

+

y

^(2)) / (2 - \

sqrt

(

x

^(3) +

xy

+

y

^(2) + 4)),

if

(

x

,

y

,

z

)! = (0, 0, 0)), (- 1

if

(

x

,

y

,

z

) = (0, 0, 0))

:

}

continuous at

(0, 0, 0) ?

code class = "asciimath" > A 2 . Is f ( x , y ) =

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