# An intgeral question

1. Apr 30, 2008

### blu3jam

$$\int\sqrt{}\frac{1+x}{1-x}$$

I am stuck on this problem. I have no idea about what to do , If you have any idea please share with me ... thanks in advance

Last edited: Apr 30, 2008
2. Apr 30, 2008

### Feldoh

Do you mean

$$\int\sqrt{\frac{1+x}{1-x}}$$ ?

I don't think there is any way to express that in terms of elementary functions.

3. Apr 30, 2008

### Dick

I think there actually is. Do the substitution u^2=(1+x)/(1-x). It just takes some patience.

4. Apr 30, 2008

### Dick

Your hint is excellent. Working the problem in full is strictly against the rules. I'm going to report this and see if it can be removed. READ THE FORUM RULES.

5. Apr 30, 2008

### Dick

janhaa, you can repost your hint. It's very good. Just leave out the full workings, ok?

6. Apr 30, 2008

### tiny-tim

Hi blu3jam!

Alternative hint: multiply top and bottom by √(1 - x).

7. May 1, 2008