**Hint** :
The function you are integrating is equal to:
$$f(x)=\begin{cases}x^2 & x \leq -1\\\ 1 & -1\leq x\leq 1\\\ x^2 & 1\leq x\end{cases}$$
**Hint** :
The function you are integrating is equal to:
$$f(x)=\begin{cases}x^2 & x \leq -1\\\ 1 & -1\leq x\leq 1\\\ x^2 & 1\leq x\end{cases}$$