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- If f(x,y,z)=ln(x2y+sin2(x+y))+227x228y2z229, then ∂4f ∂x2∂y∂z at (1,1,1) is equal toSuppose that the total cost of manufacturing x units of a certain commodity isC (x) = 2?2 + 6? + 12. Use differentials to approximate the cost of producing the 21st unit.Compare this estimate with the cost of actually producing the 21st unitIs ƒ(x, y) = x2 - xy + y2 - 3 more sensitive to changes in x or to changes in y when it is near the point (1, 2)? How do you know?