1. The problem statement, all variables and given/known data find y(t) = d(x(t))/dt where x(t) = 23sin(at)/(at) where a = 147*pi*2 2. Relevant equations 3. The attempt at a solution y(t) = 23/a * [ (t^-1) * sin(at) ] = 23/a * [ -(t^-2) * sin(at) + (t^-1) * a * cos(at) ] is this correct? my derivatives are old and rusty.