[Toán 11]

N

niemkieuloveahbu

[TEX] \left{sinx+cosx= \frac{\sqrt{2}}{2}(1)\\ x-y= -\frac{\pi}{4}(2)[/TEX]

Từ (1) ta có:

[TEX]sin(x+\frac{\pi}{4})=\frac{1}{2}\\ \Leftrightarrow \[x=-\frac{\pi}{12}+k2\pi \Rightarrow y=\frac{\pi}{6}+k2\pi\\x=\frac{7\pi}{12}+k2\pi \Rightarrow y=\frac{5\pi}{6}+k2\pi[/TEX]
 
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