phương trình lượng giác hay tuyệt

B

bienhoangthach

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N

niemkieuloveahbu

[TEX] t= \frac{3\pi}{10}-\frac{x}{2} \Rightarrow \frac{x}{2}=\frac{3\pi}{10}-t \Rightarrow \frac{3x}{2}+\frac{\pi}{10}=\pi -3t\\ Bai\ toan\ tro\ thanh:\\ sint=\frac{1}{2}sin3t\Rightarrow t\Rightarrow x[/TEX]
OK nhé
 
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