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toilamoc
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Mình có 5 bài về lượng giác mong ọi người giúp đỡ.
. Mình cảm ơn rất nhiều
1.[TEX]sin{^2}x+sin{^2}3x=cos{^2}2x+cos{^2}4x[/TEX]
2.[TEX]sin{^3}xcos3x+cos{^3}sin3x=sin{^3}4x[/TEX]
3.[TEX]sin{^2}3x-cos{^2}4x=sin{^2}5x-cos{^2}6x[/TEX]
1.[TEX]sin{^2}x+sin{^2}3x=cos{^2}2x+cos{^2}4x[/TEX]
2.[TEX]sin{^3}xcos3x+cos{^3}sin3x=sin{^3}4x[/TEX]
3.[TEX]sin{^2}3x-cos{^2}4x=sin{^2}5x-cos{^2}6x[/TEX]
4.[TEX]sinx+sin3x+sin2x= cosx+cos3x+cos2x[/TEX]
5.[TEX]sinx+cosx+1+sin2x+cos2x=0[/TEX]
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