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近几年来,三角函数问题是高考的重点之一.化简、求值、证明等式与不等的三角函数式时都需要进行恒等变形,灵活掌握变换的思路是解决三角函数时不可缺少的技能,使我们熟练合理的选用公式,以利把握变换方向,联系特定情境,寻求解题捷径,以便会给问题的解决带来生机.题型一三角函数与正余弦定理的综合正弦定理和余弦定理分别给出了三角形中的边与角的关系式.从分析角之间的关系,注意用整体思想看待角和边之间
In recent years, the problem of trigonometric function is one of the key points of the college entrance examination.The simplification, evaluation, proof of equality and unequal trigonometric functions require constant deformation, flexible grasp of the idea of transformation is indispensable when solving trigonometric functions Skills, so that we can use a reasonable formula, in order to grasp the direction of change, contact specific situations, to find a shortcut to solve problems in order to solve the problem will bring vitality. Question a trigonometric function and sine cosine theorem and The cosine theorem respectively gives the relation between the edge and the angle in the triangle.From the analysis of the relationship between the corners, pay attention to the relationship between the corner and the edge