Question 1 : Consider the equation (5x2y+6x3y²+ 4xy²)dx + (2x3 + 3x4y+ 3x²y) dy = 0. (a) Show that the equation is not exact. (b) Multiply the equation by x"y" and determine values for n and m that make the resulting equa- tion exact. (c) Use the solution of the resulting exact equation to solve the original equation.