Toán 11 Toán 11

N

nguyenlem1nh

T

tyn_nguyket

đk: cos x # 0
\Rightarrow sin x = 0 \Leftrightarrow $x=k\pi$ (TMĐK)
$[- \pi, \frac{3\pi}{2}]$ \Rightarrow x= -1; 0; 1
 
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