# Math Help - Antideriving

1. ## Antideriving

How do you antiderive/integrate this?

$\int\frac{4}{1+x^2}$

2. Originally Posted by Cursed
How do you antiderive/integrate this?

$\int\frac{4}{1+x^2}$
$\int \frac 4{1 + x^2}~dx = 4 \int \frac 1{1 + x^2}~dx$

now, $\int \frac 1{1 + x^2}~dx$ is something that should be in your text that you should memorize and never forget. $\int \frac 1{1 + x^2}~dx = \arctan x + C$