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1.形如 asina+bcosa 的三角函数式,如何变换成一个角的一个三角函数的形式呢?高二学生不觉棘手,而不少教师却因长期不用而感生疏。变换方法是这样的。设αsinα+bcosα=x(x/α sina+x/b cosα)
1. How does a trigonometric function such as asina+bcosa be transformed into a trigonometric form of an angle? Sophomores do not feel intractable, and many teachers feel strange because they are not used for a long time. The transformation method is this. Let αsinα+bcosα=x(x/α sina+x/b cosα)