Hi, I'm having a little bit of difficulty surrounding three problems I've been working on. All fall within the logarithmic/exponential derivative/limit category... 1.) http://www.synthdriven.com/images/deletable/calc01.jpg [Broken] The problem I'm having here is with what happens to -sinx to the left of zero... it's obviously positive, but less than one. I guess it's not exactly obvious as to what to do here, so I'm having a bit of difficulty. What direction do I go in from here? 2.) http://www.synthdriven.com/images/deletable/calc02.jpg [Broken] This one, I've nearly solved. I think I'm having difficulty surrounding the behavior of ...infinity... The answer I'm given for this is -1/3, but I'm not sure how to get from the second to last step depicted to -1/3. Any pointers? 3.) http://www.synthdriven.com/images/deletable/calc03.jpg [Broken] I'm not sure at all what to do with this. Chain rule? That can't be it, can it? How would you subtract one in that instance? just cosx-1? Any pointers?