ds2 = d2 + sin2(/l) d42 is a video by Meatsleep. The video is nine seconds long, and it was released on 3 October, 2015.
The video shows a light grey screen as a growling noise can be heard.
The title of the video appears to be an equation, but it is unknown what the equation is for. It is suspected to be about radiation, mass, and black holes, but that has yet to be confirmed.