∮_C (P dx + Q dy) = ∬_D (∂Q/∂x − ∂P/∂y) dA, evaluated both ways
Run this interactive Mathematics demo live below, or download it as a single self-contained HTML file that works offline in any browser or LMS — one of 1,900+ free interactive teaching demos on Notedeck. With Notedeck you upload your own materials and turn them into interactive courseware, question papers with answer keys, and AI-taught lessons.