Find the derivative (\fracdydx) for the parametric equations (x = t^2 + 2t) and (y = t^3 - 3t).
As he read, Ethan realized this was not just about solving integrals. It was a snapshot of a collaborative classroom stretched across time zones — students and instructors leaving breadcrumbs, improvements accumulating like layers of polish. The GitHub interface, usually a domain of code, had become a study hall: pull requests improved clarity, issues surfaced confusion, and the commit history preserved the path from misunderstanding to insight.