为什么1+sin²y/cos²y=(cos²y+sin²y)/cos²y
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 10:43:27
![为什么1+sin²y/cos²y=(cos²y+sin²y)/cos²y](/uploads/image/z/3154704-24-4.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%881%2Bsin%26%23178%3By%2Fcos%26%23178%3By%3D%28cos%26%23178%3By%2Bsin%26%23178%3By%29%2Fcos%26%23178%3By)
为什么1+sin²y/cos²y=(cos²y+sin²y)/cos²y
为什么1+sin²y/cos²y=(cos²y+sin²y)/cos²y
为什么1+sin²y/cos²y=(cos²y+sin²y)/cos²y
(cos²y+sin²y)/cos²y=cos²y/cos²y+sin²y/cos²y=1+sin²y/cos²y
因为 1=cos²y/cos²y
1+sin²y/cos²y=cos²y/cos²y+sin²y/cos²y
=cos²y+sin²y)/cos²y