User contributions
- 14:53, 24 April 2020 (diff | hist) . . (+1) . . Euler's Polyhedral Formula
- 14:52, 24 April 2020 (diff | hist) . . (-1) . . Euler's Polyhedral Formula
- 14:31, 24 April 2020 (diff | hist) . . (-41) . . Trigonometric identities (→Law of Sines)