三角函数的化简求值题,涉及公式众多,方法灵活,同学们一向难以完全掌握.笔者在这里介绍几种常用的变形技巧,希望对高中生数学学习有所帮助. The problem of simplifying and solving trigonometric functions involves many formulae and methods are flexible. The students have always been difficult to fully grasp. The author introduces several commonly used deformation techniques here and hopes to help mathematics learning for high school students.