The angular acceleration of a wheel is a $=8\mathrm{.}0$t$^4-8\mathrm{.}0$t$^2,$ with a in radians per second$-$squared and t in seconds. At time t $=0,$ the wheel has an angular velocity of $+2$ rad$/$s and an angular position of $+2$ rad. Write expressions for $($a$)$ the angular velocity $($rad$/$s$)$ and $($b$)$ the angular position $($rad$)$ as functions of time $($s$).$