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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
chứng minh rằng:
[TEX]\sqrt{2-\sqrt{2+\sqrt{2+....+\sqrt{2}[/TEX]=2sin[TEX]\frac{pi}{2^n+1}[/TEX]
có n+1 dấu căn ở vế trái
giup toi voi![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
@-)
>-![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
[TEX]\sqrt{2-\sqrt{2+\sqrt{2+....+\sqrt{2}[/TEX]=2sin[TEX]\frac{pi}{2^n+1}[/TEX]
có n+1 dấu căn ở vế trái
giup toi voi
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