How can you substitute 0 for x in those? They would have division by 0 which is illegal...
It has been about 8 years since I did those, so I really don't remember where to start. You probably have to get x out of the denominator somehow? Like synthetic division? Maybe L'Hospital's rule like Plindsey said (yes I know I spelled it wrong...that's how I always said it)? I think you do the derivative of it and figure it out that way.
Maybe since it's just approaching zero it's not illegal to divide by it. Must be nice doing those on graphing calculators these days.
Oh, another thought...if you can turn some of the trig functions into whole numbers it could help. There are all sorts of them in your calc book most likely. In any event, you better post the answers.