三角变换以其纷繁复杂的公式、多变的题型,让同学们颇感困难.通常,要掌握三角变换问题的解题策略,我们可以从四个字人手,即“角、名、形、幂”.①“角”指角的变换.在三角变换中,往往会出现较多相异的角,可根据角与角之间的和、差、倍、半、互补、互余等关系,运用角的变换,沟通条件与结论中角的差异,实现角的统一.②“名”指函数名称的变换.在三角变换中,常常需 The trigonometric transformation is difficult for students because of its complicated formulas and variable question types. Usually, to master the problem solving strategy of the triangular transformation problem, we can use four words, namely, “angle, name, and shape”. , Power “.1” Angle “corner ” transformation. In the triangular transformation, there will often be more different angles, according to the angle and angle between the sum, difference, times, half, complementary, mutual Remainder relationship, the use of angle transformation, the difference between the communication conditions and the conclusion of the middle angle, to achieve the unity of the angle. 2 “Name” refers to the transformation of the function name. In the triangular transformation, often need