1. The problem statement, all variables and given/known data I'll post it as an image since the notation will be tricky to type out. It's problem 4. http://img29.imageshack.us/img29/1228/307hw3.jpg [Broken] 2. Relevant equations Not sure this really applies here 3. The attempt at a solution This is for a physics course but as you can see it's pretty much math. If you think it'd do better in a math section please feel free to move it. Without really doing much math I considered the integral from -infinity to where the function is not zero, the integral in the region where it's not zero, and the integral from where it starts to be zero again to infinity. Adding them together should give me the total integral. The zero area multiplied by f(x) should still be zero (I think, right?). Therefore the only integral of concern is where the dirac function is not zero. Now what I think it's saying is that this integral should be the same as just evaluating f(x) at zero? If that's true I'm not really sure how to do it.