2. (a) [6] Find g'(x), where 9 17 tan (ax -bx+c?) g (x ) = 4 cost(2t) at 91000 (b)[6] Evaluate the limit or show that it does not exist: lim D - sin (x - 1) . cos (x - 1) DER x-1 x [ (t - 1)dt]