The displacement from equilibrium of an object in harmonic motion on the end of a spring is D(t) = cos(12t)-sin(12t) where D(t) is measured in feet and t is the time in seconds. a. What is the position of the object when t= b. How fast is the object moving at t = =? In what direction is it moving? a. How fast is the object moving at t = =? In what direction is it moving? time