

Giúp mình với
[tex]a, sin2x=1+\sqrt{2}cosx+cos2x[/tex]
[tex](sin2x+\sqrt{3}cos2x)^2-cos(2x-\frac{\prod }{6})=5[/tex]
[tex]a, sin2x=1+\sqrt{2}cosx+cos2x[/tex]
[tex](sin2x+\sqrt{3}cos2x)^2-cos(2x-\frac{\prod }{6})=5[/tex]
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