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- Problems and solutions of the [[APMO]]. * [[1989 APMO]]7 KB (626 words) - 20:52, 19 August 2023
- ...is a method to express [[angles]] that can be very useful in angle chasing problems where there are configuration issues. ...h>180^{\circ}</math>, taking half of a directed angle may cause unexpected problems.4 KB (657 words) - 19:52, 25 December 2024