Not too sure if this is the correct area, but hopefully someone can help!
I've got a problem that has arisen from another problem:
but I can't see how to go from the last line to:
You will find that that particular question has been solved at least once in these forums (use the Search tool).
I wonder what's going on with MGF... there have been several these last 2 days
And this question is part of this : http://www.mathhelpforum.com/math-he...97251-mgf.html
If you didn't understand some steps, you could've just asked them there, I would have answered...