Hi, masters.

Can I ask a question about definite integration?

Integration from 0 to pie (xsin(1-x^2)dx)

I substituted (1-x^2) = t, so -1/2 integration (sint dt).

I changed the range to from 1 to 1 - pie^2 as I used substitution.

So, finally I got the answer -1/2(cos(1) - cos(1-pie^2)).

But, the answer is a bit different 1/2(1 - cos(1-pie^2)).

Can I ask what I did wrong?

Thanks a lot.