▲ 1 r/calculusSpherical Law of Cosines and a little proof that a sphere is a manifoldhttps://preview.redd.it/0izjtlxtcutg1.jpg?width=2186&format=pjpg&auto=webp&s=ad04a782622165f4356d0276e94fe94d27dcfcdd https://preview.redd.it/2rvrjh8vcutg1.jpg?width=2017&format=pjpg&auto=webp&s=35b9d303301fda521c6f727a19b1f28dd89a0c26 reddit.com u/Lost-Grocery6718 — 10 hours ago