may I ask you what is very confusing posting about that equation?This is a very confusing posting!
Look HERE. You need to learn how to use the available on line resources!
Did you try the hint I gave in post #2?Also I asked how to do it by substitution method, not by expanding everything then integrate like your website did.
yes sir, I multiplied the brackets, but still not sure how i can do the cancellationDid you try the hint I gave in post #2?