Problem A. 672. (May 2016)
A. 672. Point \(\displaystyle O\) is the apex of an oblique circular cone. Show that there are some points \(\displaystyle F_1\) and \(\displaystyle F_2\) in the interior of the base such that \(\displaystyle \angle XOF_1 +\angle XOF_2\) is constant when \(\displaystyle X\) runs along the perimeter of the base disk.
(5 pont)
Deadline expired on 10 June 2016.
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