# Multivariable Limits examples and sq. thm

1. Jul 17, 2013

### texas

So I'm trying to study for my calc 3 exam, but I have noticed that my book doesn't have many limit questions that use sin/cos/tan, but I know those will likely be on the test. I have tried to google but I can't find many examples that have solutions. Are there any free sites that have problems to help me practice?

Also, I can't seem to figure out when to use the squeeze theorem. In general, when do you look for it?

2. Jul 17, 2013

### Mandelbroth

Well, I can think of one REALLY good one that's open in your browser right now.

I periodically stalk the forums here looking for something fun to occupy my time.

When you recognize a function $h$ that is always greater than or equal to $f$ on an interval $I$ and a function $g$ that is always less than or equal to $f$ on the same interval, you might think about using it. The key is to get a $g$ and $h$ that have limits equal to each other at the point you want to take the limit of $f$ at in $I$.