M
miumiu34


[TEX]6sin^23x+cos12x=4[/TEX]
[TEX]cos^2(3x+\frac{pi}{2})-cos^23x-3cos(\frac{pi}{2}-3x)+2=0[/TEX]
[TEX]1+cos2x+cos4x=0[/TEX]
[TEX]cos^2(3x+\frac{pi}{2})-cos^23x-3cos(\frac{pi}{2}-3x)+2=0[/TEX]
[TEX]1+cos2x+cos4x=0[/TEX]