Find the point on the plane 8x - y + 8z = (x, y, z) =...

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Find the point on the plane 8x - y + 8z = (x, y, z) = 80 nearest the origin. Find all second partial derivatives of the following function at the point x。. f(x, y) = sin(xy); ×о = (л, 4) 22f 2х2 22f Әх ду 22f ду Әх 22f ду? 0 = 0 = 0 0 х х Find the point on the plane 8x - y + 8z = (x, y, z) = 80 nearest the origin. Find all second partial derivatives of the following function at the point x。. f(x, y) = sin(xy); ×о = (л, 4) 22f 2х2 22f Әх ду 22f ду Әх 22f ду? 0 = 0 = 0 0 х х