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A5

Part of 1953 Putnam

Problems(1)

1953 Putnam A5

Source: 1953 Putnam A5

8/20/2021
S is a parabola with focus F and axis L. Three distinct normals to S pass through P. Show that the sum of the angles which these make with L less the angle which PF makes with L is a multiple of π.
Putnamconics