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所谓“变”即将题设条件或结论进行适当的变换,使条件与结论便于沟通,有利于问题的解决.1.变角在三角运算中,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,使问题迎刃而解,常用的变角方法有:①将结论式中的角向条件式中的角转化;
The so-called “change” is about to set the conditions or conclusions of the appropriate transformation, the conditions and conclusions facilitate communication, is conducive to the solution of the problem.1.Diagonal In the triangle operation, according to the angle and angle between the sum, difference, times , Half, complementary, mutual relations and other relations between the use of the corner of the transformation of communication conditions and the conclusions of the corner of the difference, to solve the problem, commonly used methods of transformation are: ① the angle of the formula in the angle of the angle conversion;