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chitandpi
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Bài 1 : Tính tan 15 độ mà ko dùng máy tính
Bài 2 : CMR $Cos^6 \alpha + Sin^6 \alpha + 3Sin^2Cos^2 \alpha = 1$
Bài 2 : CMR $Cos^6 \alpha + Sin^6 \alpha + 3Sin^2Cos^2 \alpha = 1$
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