Final answer:
To find all functions n(x, y) such that the given differential equation is exact, we need to check if the equation satisfies the condition for exactness.
Step-by-step explanation:
To find all functions n(x, y) such that the given differential equation is exact, we need to check if the equation satisfies the condition for exactness. The condition for exactness is that the partial derivatives of the function should be equal:
∂n/∂x = M(x, y) and ∂n/∂y = N(x, y)
If the equation satisfies this condition, then the function n(x, y) exists and the equation is exact. If not, the equation is not exact. However, without the specific equation mentioned in the question, it is not possible to determine the exact functions n(x, y).