# YIPES! Integrals!

1. May 1, 2005

### Echo 6 Sierra

$$\int\frac{xdx}{1+x^4}$$ I picked $$u=x^2$$ and made du=2xdx which makes 1/2du=xdx.

Now I have: $$\displaystyle{\frac{1}{2}}$$$$\int\frac{du}{1+u^2}$$

If the almighty green-bottled lager from Holland has been good to me, I get:

$$\frac{1}{2} \arctan x^2+c$$

Is this: a) correct, b)good enough or c)can this be tweaked?

So help me, if I get at least a B in Calculus I will be near Spiritual Creaminess.

2. May 1, 2005

### Pyrrhus

Yes it's correct.