《矩阵与变换》是高中课程选修系列4的一个专题.在北京师范大学出版的教材中,对旋转变换只介绍了逆时针旋转90°这一种变换,而在课后习题B组题中却给出了这样一道题:试通过访问、咨询或读书自学等方式了解三角函数及三角变形公式,并完成以下内容:1)利用右图,研究矩阵M=cosθ-si “Matrix and Transform” is a feature of the high school curriculum elective series 4. In the teaching materials published by Beijing Normal University, only a transformation counterclockwise rotation of 90 ° is introduced for the rotation transformation. However, in Group B exercises Given such a question: try to learn trigonometric functions and trigonometrical deformation formulas through interview, consultation or reading self-study, etc., and complete the following: 1) Using the right graph, we study the matrix M = cos θ-si