Hey all, just doing some homework in preparation for the quiz tomorrow (well, today...it's in 4 hours).

Running into trouble with using limits to compute derivatives.

Here are the problems:

Use limits to compute the following derivatives:

1. where

Pretty sure limit here is zero, but I do not understand how I would visualize this with much harder equations...

2. where

3. where

Also confused about questions asking to compute limits that involve infinity:

1.

2.

3.

Read the textbook a few times but cannot seem to grasp it... Would appreciate some help or at least a guide that is easy to comprehend.

Another concern is the +'s and -'s atop of infinity. As far as I understand, these signify which direction to count the limit from. Anymore help would be greatly appreciated!