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三角恒等变换主要是运用三角公式进行三角求值、化简与证明.解三角函数题时常用到切割化弦、角的变换、降幂或升幂、和积互化等化归与转化思想.而要实现上述转化,在解题过程中还要注意两个统一:一是函数名称的统一,二是角的统一.为此,在解题过程中要有消元的意识:同一个问题中出现的角要尽量的少,涉及的三角函数名称要尽量的少.所以三角恒等变换的过程实际上就是三角消元的过程.1.消非特殊角
Triangular transformation is mainly the use of trigonometric trigonometry evaluation, simplification and proofing. Trigonometric function problems are often used to cut the string, angle transformation, to reduce or increase the power, and the integration of equalization and conversion thought In order to realize the above transformation, two unifications must be paid attention to in the problem - solving process: one is the unification of function names and the other is the unification of angles. In the corner appears as little as possible, involving the trigonometric function name as little as possible.Therefore, the process of triangular equal transformation is actually the process of elimination of the triangle.1.Determination of non-special angle