I have this function: f(x,y)=ln(x^2+y^2)
Find the boundary of the function's domain

I have this function: f(x,y)=ln(x^2+y^2)
Find the boundary of the function's domain

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i can only think of the restriction that ln cannot be 0
x^2 + y^2 = 0 would only occur at (0,0)

why? what makes (0,0) the boundary point?

can you explain?

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