- #1

autodidude

- 333

- 0

http://amc.maa.org/a-activities/a7-problems/putnam/-pdf/2011.pdf

The solution is here but it starts off by claiming that (-1, 2/π) works and then they show it works.

http://amc.maa.org/a-activities/a7-problems/putnam/-pdf/2011s.pdf

My question is how they found (-1, 2/π)