化简cos²a-sin²a分之sin⁴a-cos⁴a=?化简sin⁴a-cos⁴a--------------- =cos²a-sin²a
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 18:51:39
![化简cos²a-sin²a分之sin⁴a-cos⁴a=?化简sin⁴a-cos⁴a--------------- =cos²a-sin²a](/uploads/image/z/1746496-64-6.jpg?t=%E5%8C%96%E7%AE%80cos%26%23178%3Ba-sin%26%23178%3Ba%E5%88%86%E4%B9%8Bsin%26%238308%3Ba-cos%26%238308%3Ba%3D%3F%E5%8C%96%E7%AE%80sin%26%238308%3Ba-cos%26%238308%3Ba---------------+%3Dcos%26%23178%3Ba-sin%26%23178%3Ba)
化简cos²a-sin²a分之sin⁴a-cos⁴a=?化简sin⁴a-cos⁴a--------------- =cos²a-sin²a
化简cos²a-sin²a分之sin⁴a-cos⁴a=?
化简
sin⁴a-cos⁴a
--------------- =
cos²a-sin²a
化简cos²a-sin²a分之sin⁴a-cos⁴a=?化简sin⁴a-cos⁴a--------------- =cos²a-sin²a
(sin⁴a-cos⁴a)/(cos²a-sin²a)
=(sin²a+cos²a)(sin²a-cos²a)/(cos²a-sin²a)
=-(sin²a+cos²a)
=-1