# Math Help - test

1. ## test

$\int$

2. $\int_a^x$

3. $\int_\infinity^\infinity$

4. Originally Posted by iLikeMaths
$\int_\infinity^\infinity$
$\int_{-\infty}^{\infty}f(x)~dx$ is given by $$\int_{-\infty}^{\infty}f(x)~dx$$