Hi. I have this problem on my homework:

I know it's the indeterminate form

. I've tried using l'Hopital's Rule, but it doesn't seem to help. (It just becomes

which isn't any better.)

I've also tried combining the fractions and taking the derivative, which is extraordinarily tedious and also doesn't help. I know by graphing that the limit is supposed to be 1/2, but I can't figure out a way to make that work. Is there something I'm missing? I haven't been this bothered by a math problem in a long time. Any help you can offer would be greatly appreciated. Thanks!