Hello Im still confused as to when i should change the limits. so far i have$\displaystyle \int_0^1 \arcsin(z)$ =$\displaystyle arcsin(z)\mbox{z}\$-$\displaystyle (1-z^2)$ with use of integration by parts and then substitution like if it were indefenit but do i have to change the limits or once i substitute back can i use the original limits to find the answer? Thank you