the second one I just converted the variables to a more hospitable form and applied general integration technique..
the second one I just made it so it was an example of after doing this I could integrate as though it was just ...so by making the derivative of the inside on the outside I could integrate as though it was just and get and then you substitute back in the
http://www.mathhelpforum.com/math-he...-tutorial.html first of all that will teach you how to use LaTeX and be better understood...now on to the integrals ...for this one honestly I would jsut distribute and integrate...or use the method I will show you on the others
2) ..for this you must make a u-substitution..so you say that ...then say that ..and finally then you have that ..and now you can see that this has no means that you could use to find the integral...there are ways but trust me for your level you must have copied it down wrong
3)Ok for this one we have which I wont do for you but I will give you a hint