Problem 1 Given a first-order differential equation: 1 + x2 dy - ydx = 0 a) What is the best solution method in solving the given differential equation? b) Solve for the general solution of the given differential equation. Express your answer in explicit form, i.e., y = f(x). c) If y(1) = 1, solve for the particular solution of your answer in part (b). d) Using your answer in part (c), find the exact value of y(-1)