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it should be solved by part integration! but i dont know which is dV and which is U?

sin(x)cos(x)=1/2sin(2x) how?

:)

sry. i mean odd and even function. sinx is an odd function!

http://www.wolframalpha.com/input/?i=integrate+xsinxcosx+from+-pi+to+pi

if you want to solve it visually..

ok