The angle 0 through which a disk drive is given by 0 (t) = a + bt- ct3,where a, b, c are constants, t is given in seconds and 0 is in radians. When t = 0, 0 = ,r/4 rad and the angular velocity is 2.00 rad/s and when t = 1.50 s, the angular acceleration is 1.25 rad/s2. Find a, b, c including their units.