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Let f(x, y) = sqrt( x^2 − y − 4) ln(xy). • Plot the domain of...

Let f(x, y) = sqrt( x^2 − y − 4) ln(xy).

• Plot the domain of f(x, y) on the xy-plane.

• Find the equation for the tangent plane to the surface at the point (4, 1/4 , 0).

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