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Please help with those questions. Find the equation of the plane tangent to f(x, y) = In ( vx2 + y2 ) at the point

Please help with those questions.

Find the equation of the plane tangent to f(x, y) = In ( vx2 + y2 ) at the point where (x, y) = (4, 3) 2 = Use this to approximate f(4.1, 2.9)Find the differential for z = sin (3x + 7y) when (x, y) = (0, 0) dz =

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