1. Compute the derivatives of the following functions with respect to a, where they exist. You may use the results of the other problems on this homework if you like. Also note that the derivative function may exist at some points but not others. All logarithms are to the base e unless otherwise noted. (a) f(x) = x/x. (b) f(x) = x2 log(1 - x2). (c) f(x) = xx). (d) f(x) = log r+1 ' (e) f(x) = ", x > 0