Let ABCD be a cyclic quadrilateral with its diagonals AC and BD intersecting at P. Points W, X, Y, Z are constructed outside of quadrilateral ABCD, such that triangles WAB , XBC, YCD, ZDA are equilateral. Prove that ∠WPZ + ∠YPX = 180°.
(题目为2025年IMONST 2 Junior组第5题）
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