“函数”是贯穿于高中数学的一条主线,函数图象又是表述函数问题的重要工具,因此函数图象问题与其它知识的联系非常紧密·尤其是导数和向量的引入,拓宽了函数图象问题的命题空间,出现了不少的创新题,下面介绍几例·例1已知函数y=→a·→b,其中→a=(1,sin|x|),→b=(x,1),当x∈[- “Function” is a main thread that runs through high school mathematics. Function image is also an important tool for expressing function problems. Therefore, functional image problems are closely related to other knowledge. Especially the introduction of derivatives and vectors has broadened the function image. The problem proposition space, there have been a lot of innovative questions, the following describes a few cases. Example 1 Known function y = → a → b, where → a = (1, sin | x |), → b = (x, 1) when x∈[-