) is the same as the original
function that you wanted to integrate. In this case, a little algebra will
produce the result you are trying to find. Try integrating 
.
Sometimes, along the way, one of the
integrals you get (in the form ) is the same as the original
function that you wanted to integrate. In this case, a little algebra will
produce the result you are trying to find. Try integrating .
At this point, we let 
and 
so
that 
and 
. This gives
us
Now we simply add 
to both sides of the equation
and divide by two to get
