so here's the problem....
lim [ (2^x - 1) / x ] as x-> 0
i never get these right. how would you do this?
Wow, how do you guys know to do all these wacky substitutions? Are these tricks you've memorized? Or like, do you think 'Let's make a sub in there and see what happens next', or can you see it all straight away? For instance with Krizalid's sub I would never have seen it coming in a hundred years