高一学生分析问题时最缺乏的就是目标意识,有的同学拿到三角函数性质的题目,想半天都没有一个明确的解题方向,其实所有这类问题都是首先将目标三角函数化为“三个一”:y=Asin(ωx+φ)+k的形式,即一个角的一种函数名称的一次式的形式,因为课本中三角函数的每一种性质都是由“三 High school students analyze the problem is the most lack of awareness of the target, some students get the nature of trigonometry problems, would like a half-day there is no clear direction of the problem-solving, in fact, all such problems are the first to target trigonometry into “ Three one ”: y = Asin (ωx + φ) + k, that is, a function of the angle of a function of the form, because each character of the trigonometric functions in the textbook by the" three