I didn't really get #22 on the homework (ch. 2.1). Does the limit not exist? Because all of the terms had an "h" in them when I tried to solve it, which would make the denominator 0.

I just finished the homework...and it went really well. The trigonometric limits really make sense to me. I really like the online textbook...especially being able to look at the steps to find the answer instead of just the solution.