

1) [tex]\small \frac{sin^{4}2x+cos^{4}2x}{cos^{4}2x-sin^{4}2x}-\frac{1}{2}\times cos4x=\frac{\sqrt{3}}{2sin4x}[/tex]
2) [tex]\small cos^{3}+\frac{1}{2}\times sin2x-cosxsin^{3}x+4sinx+4=0[/tex]
2) [tex]\small cos^{3}+\frac{1}{2}\times sin2x-cosxsin^{3}x+4sinx+4=0[/tex]