Two new trigonometrical inequalities and their appliance .

两个新的三角不等式及应用。

Abstract : the trigonometrical is a high school partial heavydifficulty . Its content is abstract , the formula is many , dexterous , the student is not easy to understand , grasps .

摘要：三角函数是高中部分的一个重难点，其内容抽象，公式繁多，技巧性强，学生不易理解，掌握。