t 3 -------- - -------- 3 3 (t + 3) (t + 3)
-3.0/(3.0 + t)^3 + t/(3.0 + t)^3
-3 + t -------- 3 (3 + t)
-3 + t --------------------- 3 2 27 + t + 9*t + 27*t