so at the very end when i integrated (2t + cost) i got (t^2 + sint)..... then i plugged in positive and negative Pi/2...

in which i got [(Pi/2)^2 + sin(Pi/2) - (-Pi/2)^2 + sin(-Pi/2)]......

then i got [((Pi^2/4) + 1) - (-Pi^2/4) + -1]..... IS THAT RIGHT?