When you have solved your original exam, compute the following, showing all the steps in your work and explaining in full detail why you are making those decisions (a) (t + csc cot (t) + e 15t) dt (b) The value of a for which we can guarantee that f(x) = ln (ax x + 3) has a hori- zontal tangent line in the range (1,2). (c) d dx Xx3 sin-1(x))