$\int\limits _{- \infty}^{\infty} \frac{\sin(x)}{x} dx$ In order for you to find the integration of this one, you must break your integral into 2 parts:$\int\limits_{- \infty}^{0} \frac{\sin(x)}{x} dx + \int\limits_{0}^{\infty}\frac{\sin(x)}{x} dx$ then you can cmpute the integral :)