(5 points) Calculate all four second-order partial derivatives and check that fxy = fyx. Assume the variables are restricted to a domain on which the function is defined. f(x, y) = 4 sin(6x) cos(3y) fxx = fyy = fxy = fyx = Note: You can earn partial credit on this problem. Preview My Answers Submit Answers You have attempted this problem 1 time. Your overall recorded score is 0%. You have 2 attempts remaining.