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1> \frac{3(Cos2x+Cot2x)}{Cot2x-Cos2x}-2Sin2x=2
2>Sin^2(2x)-Có^2(8x)=Sin(\frac{17pi}{2}+10x)
3> 1+Sin\frac{x}{2}.Sinx-Cos\frac{x}{2}.Sin^2x=2Cos^2(\frac{pi}{4}-\frac{x}{2})
4>\sqrt[2]{5-3Sin^2x-4Cosx}=1-2Cosx
5> Sinx.Sin2x=-1
6> Sinx + cos4x=2
Thanks all
2>Sin^2(2x)-Có^2(8x)=Sin(\frac{17pi}{2}+10x)
3> 1+Sin\frac{x}{2}.Sinx-Cos\frac{x}{2}.Sin^2x=2Cos^2(\frac{pi}{4}-\frac{x}{2})
4>\sqrt[2]{5-3Sin^2x-4Cosx}=1-2Cosx
5> Sinx.Sin2x=-1
6> Sinx + cos4x=2
Thanks all