Alright, since it appears we are playing trivia, lets see how long it is before some one answers this one... Without cheating!! Not that it is hard, but just a little tricky. (as I learned in my differential equations course.)
1) e^-ln(x)
2)
Have fun, no cheating.
BTW @ Neal, you are correct, the biggest part about doing maths or any thing that is abstract is not reading it in a book or seeing that it is true online. But actually proving to yourself that yes, this does indeed work.. Then, it truly becomes your tool to use.