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三角恒等变换是解决有关三角问题的重要环节,它以同角三角公式、诱导公式、和、差、倍角公式为基础,将公式广泛应用于三角函数的三大基本问题:求值、化简、证明。在运用这些公式进行三角恒等变换时,要选择好解题的突破口,即在变换时,把握好“三看”策略:一看角的差异,二看函数名称的异同,三看式子的结
Triangle Equality Transformation is an important link to solve the triangle problem. Based on the same trigonometric trigonometry formula, the induction formula, and the difference, multiplier angle formula, the formula is widely used in three basic problems of trigonometric function: evaluation, simplification ,prove. In the use of these formulas triangle transformation, to choose a good solution to the problem, that is, in the transformation, grasp the “three see ” strategy: a look at the difference between the angle, Son’s knot