Hacker News Reader

So you can use sin(x) for various x to tell what you are running on. Maybe even in the browser?

There is a shader which uses similar idea to detect what kind of GPU you have https://www.shadertoy.com/view/slySWV

V8 and SpiderMonkey have converged to the same underlying library (fdlibm), partly for the interoperability, so you generally can't.