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文[1]介绍了从常规及构造有理化因式、代数换元引进参数和三角代换等多角度解第31届西班牙数学奥林匹克竞赛题第二题:
The paper [1] introduced the second question of the 31st Spanish Mathematical Olympiad from the perspectives of conventional and structural rationalization factors, algebraic exchange parameters, and trigonometric substitutions.