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Empirical value mathematics
Analysis: Make the perpendicular line of AB, and then answer according to the properties of equilateral triangle and congruent triangles.

Solution: the middle vertical line is AB,

∫△ABC is an equilateral triangle, △ABD is an isosceles triangle;

∴AB's middle vertical line must pass through C and D, ∠ BCE = 30;

AB = BP = BC,∠DBP=∠DBC,BD = BD

∴△BDC≌△BDP, so ∠ BPD = 30.

Therefore, the degree of ∠BPD is 30.

Note: This question is not difficult. The key to solve this problem is to make auxiliary lines and then use the properties of equilateral triangles to solve it.

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