Problem 3. Buck: Section 7.6: 6. (a) Let ƒ be a C¹ function of one variable with ƒ(1) = 0. What additional condition on f will allow the equation 2ƒ(xy) = f(x) + f(y) to be solved for y in a neighborhood of (1,1)? (b) Obtain the explicit solution for the choice f(t) = t² – 1.