2 14*t - 14
14*t^2 - 1*14
1*(t + 1)*(t - 1)
(1*(t + 1))*(t - 1)
-14.0 + 14.0*t^2
/ 2\ 14*\-1 + t /
14*(-1 + t^2)
14*(1 + t)*(-1 + t)