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(Solved): Find and sketch the domain of each of the functions of two variables: \( 1 . \) \[ f(x, y)=\frac{\s ...
Find and sketch the domain of each of the functions of two variables: \( 1 . \) \[ f(x, y)=\frac{\sqrt{4-x^{2}-y^{2}}}{2 x+y} \] 2. \( f(x, y)=\ln (1+x y) \)
