T
thien0526


giai pt sau
[TEX]1) sin2xcosx+sinxcosx=cos2x+sinx+cosx[/TEX]
[TEX]2) \frac{1+sin2x+cos2x}{1+cot^2 x}=\sqrt{2} sinxsin2x[/TEX]
[TEX]1) sin2xcosx+sinxcosx=cos2x+sinx+cosx[/TEX]
[TEX]2) \frac{1+sin2x+cos2x}{1+cot^2 x}=\sqrt{2} sinxsin2x[/TEX]
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