Thread: U substitution with Trigometric Integrals

1. I was wondering if anyone can explain to me how do you know in a trig integral what portion to set as u. It seems obvious in most integrals but not with trig (at least for me). Just wondering what thought process some of you mathmatical minds go through.

2.

3. Wow! I almost know this! Just a few more days of study and I would know the answer... (What a pointless post I just made.)

4. Keep studying so that when you do know you can tell me. lol

I am doing U substition exercises from section 5.5 in the James Stewart "early transcendentals" 6th edition. I believe its the same one you are using.

We are in chapter 7 right now in my class and Trig Substitution relies on U substitution in certain cases. I am just trying to get my basics down very firm.

5. Wow! Yea, its the same book as I am using in 5th edition I believe. I am in chapter 7 as my chapter 7: integration techniques thread says, and serpico I believe said he's taught calc with the same book.

6. Yeah, cool. I am on trigometric substition right now. It helps to go back and look at all the Trig Identities once you start on that section.

7. I'm assuming you're asking about section 7.2. I think Stewart has a pretty good list of what you're supposed to do in many situations. Really, he covers two types of integrals: products of sines and cosines, and products of tangents and secants. I'd go over the steps to do each kind, but I'd really just be reiterating what Stewart says. However, if you have some specific problems, we'd be happy to work through them with you.

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