(E) f ′(x) = 4x^3 − 12x^2 + 8 x = 4x(x − 1)(x − 2).(E)(A)(D)(E) Replace t by 1.(D)(D) y′ = ex · 1 + ex(x − 1) = xex; y′′ = xex + ex and y′′(0) = 0 · 1 + 1 = 1.(E) When simplified, (B) Since (if sin t ≠ 0)