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所谓三角代换法解代数题,就是把代数式变换成三角表达式,变代数题为三角题去求解的一种数学方法.三角代换法解题的关键是,根据代数式的构造特征和解题的需要,选择一些合适的三角函数(或三角函数式)去代换代数式中的变数.
The so-called trigonometric substitution method for solving algebraic problems is a mathematical method that converts algebraic expressions into trigonometric expressions and converts algebraic problems into trigonometric ones. The key to the problem of trigonometric substitution methods is that they are based on algebraic structures and problem solving. For the needs, select some appropriate trigonometric function (or trigonometric function) to replace algebraic variables.