Hello fellow math members!

I can't find this area of this two function intersecion:

Y1=$\displaystyle x^3-x$

Y2=sin(pi*x)

For $\displaystyle -1\leq x\leq 1$

From what I know, I need to do y1=y2 initially, right?

But even that I did't get to resolve =/

Any help? ^^

Here is the answer:

Spoiler:

Thanks!