求证sin^2x+sin^2y-sin^2x*sin^2y+cos^2x*cos^2y=1
答案:2 悬赏:10 手机版
解决时间 2021-01-25 00:47
- 提问者网友:蓝琪梦莎
- 2021-01-24 09:27
求证sin^2x+sin^2y-sin^2x*sin^2y+cos^2x*cos^2y=1
最佳答案
- 五星知识达人网友:过活
- 2021-01-24 09:58
sin^2x+sin^2y-sin^2x*sin^2y+cos^2x*cos^2y= sin^2x-sin^2x*sin^2y+sin^2y+cos^2x*cos^2y= sin^2x*(1-sin^2y)+sin^2y+cos^2x*cos^2y= sin^2x*cos^2y+sin^2y+cos^2x*cos^2y= sin^2x*cos^2y+cos^2x*cos^2y+sin^2y= cos^2y(sin^2x+cos^2x)+sin^2y= cos^2y *1 + sin^2y= cos^2y + sin^2y= 1
全部回答
- 1楼网友:渡鹤影
- 2021-01-24 10:46
谢谢了
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