[Toán 11] Lượng giác

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niemkieuloveahbu

[TEX]PT \Leftrightarr sin(2x-\frac{\pi}{12})+sin(- \frac{\pi}{12})=\frac{1}{\sqrt{2}}\\ \Leftrightarro sin(2x-\frac{\pi}{12})=\frac{\sqrt{6}+\sqrt{2}}{4}=sin{ \frac{5\pi}{12}}[/TEX]
 
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