Dsolve different answer with book

Hello! I "Differential equations with Matlab" book. In problem set 1.2 17 a(t)=1/(t+1)^3, v0=0; x0=0; book's answer 1/2[(t+1)^-1 + t-1] but matlab dsolve('D2y=1/ ((t+1)^3)', 't') give me C1 + C2*t + 1/(2 * (t+1)) and after subs -> 1/2(t+1).

Why different answer? Or I something miss?

Answer 1

[Andrey]

SOLVED dsolve('D2y=(t+1)^-3', 'Dy(0)=0', 'y(0)=0')