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DE-BUNDESWETTBEWERB 2013 Problem 3

  • Round 1

In the interior of the square ABCDABCD , the point PP lies in such a way that ∠DCP=∠CAP=25∘\angle DCP = \angle CAP=25^{\circ} . Find all possible values of ∠PBA\angle PBA .

Dataset text AI-MO AoPS. Quoted with source.

Official text: Bundeswettbewerb Mathematik 2013 official paper, page 1.

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