T
tuananh213
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
giải dùm tui bài lượng giác này coi mấy sư
[tex]2cos x+\frac{1}{3}cos^2( x+\large\pi)= \frac{8}{3}+sin 2x+ 3cos( x+\frac{\large\pi}{2})+ \frac{1}{3}sin^2x[/tex]
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
[tex]2cos x+\frac{1}{3}cos^2( x+\large\pi)= \frac{8}{3}+sin 2x+ 3cos( x+\frac{\large\pi}{2})+ \frac{1}{3}sin^2x[/tex]
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