Use the "mixed partials" check to see if the following differential equation is exact. if it is exact find a function f(x, y) whose differential, df(x, y) gives the differential equation. that is, level curves f(x, y) = c are solutions to the differential equation: dy _ -2x4 – 4y dx = 4x + 4y4 first rewrite as m(x, y) dx + n(x, y) dy = 0 where m(x, y) = and n(x, y) = if the equation is not exact, enter not exact, otherwise enter in f(x, y) as the solution of the differential equation here = c.