dx2 (a) Find a solution for the first-order ordinary differential equation, = -4 f(x), subject to the boundary condition f(0) = 1. Is this an oscillatory solution? das (b) Find a general solution for the second-order ordinary differential equation, -4 f(x). Is this an oscillatory solution? (c) A separable wave equation in 2D has the solution f(x, y) = A sin mx cos ny where A is a real constant. If the wave equation is written as daf daf dx2 'dy2 = c f(x) what is the value of the constant C in this equation as a function of m and n. On the submission quiz, you will be given values of these integers and asked to compute C. (x,y) +