User contributions
- 19:07, 7 September 2019 (diff | hist) . . (-510) . . Change of base formula (→Proof 2)
- 11:20, 7 September 2019 (diff | hist) . . (+23) . . Change of base formula (→Proof 2)
- 11:18, 7 September 2019 (diff | hist) . . (+488) . . Change of base formula