The red one should be "+" not "-".=Em Yeu Anh;440924]If I have done this correctly,
the integral is then
Also the 2`s will cancel.
and the integral will be:
Clearly: <--- Do you know why?
Substituting this in the integral:
This first one can be solved using integration by parts.
The second one can be solved by using a U-Substitution.