X
xoaitay
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[tex]cosx.cos{\frac{x}{2}.cos{\frac{3x}{2} + sinx.sin{\frac{x}{2}sin{\frac{3x}{2} =\frac{1}{2}[/tex]
và
[tex]9sinx+ 6cosx - 3sin2x + cos2x = 8[/tex]
ai giải dc minh thanks luôn.![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
và
[tex]9sinx+ 6cosx - 3sin2x + cos2x = 8[/tex]
ai giải dc minh thanks luôn.
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