# Homework Help: Problem with Integration Problem

1. May 7, 2010

### thereddevils

1. The problem statement, all variables and given/known data

Evaluate the following integrals .

(1) $$\int \sin \frac{1}{x} dx$$

(2) $$\int \sin x^2 dx$$

2. Relevant equations

3. The attempt at a solution

i don see a way to transform those integrals to a form where i can integrate them

2. May 7, 2010

### zachzach

Re: integration

I know $$\int \sin x^2 dx$$ does not have an integral in terms of elementary functions so you have integrate its Taylor series or something else.

3. May 7, 2010

### zachzach

Re: integration

Have you tried that? It does not work.

4. May 7, 2010

### thereddevils

Re: integration

I have not heard of the taylor series , maybe these questions are not for my level .

5. May 7, 2010

### physicsman2

Re: integration

Ever heard of the reduction formulas?

6. May 7, 2010

### The Chaz

Re: integration

There are a lot of mysterious posts by this "estro" character that suddenly disappear... it's like the Bermuda Triangle of PF!

7. May 7, 2010

### thereddevils

Re: integration

how can that happen ? I dont see his post or he can delete his own posts ? I thought only the mods or admins can do that , this is strange.

8. May 7, 2010

### estro

Re: integration

I did delete my post, as it was foolish...

9. May 7, 2010

### The Chaz

Re: integration

Don't be so hard on yourself! Plus, I like my Bermuda Triangle PF Theory better.