$sinx.cosx \ne 0$
$\Leftrightarrow sin2x \ne 0$
$\Leftrightarrow 2x \ne k\pi$
$\Leftrightarrow x\ne k\dfrac{\pi}{2}$ $(k \in Z)$
Vậy tập xác định $D$ của hàm số $y$ là:
$D = R$ \ {$k\dfrac{\pi}{2}, k \in Z$}
Đáp án:
Giải thích các bước giải:
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viết laị câu sau ,bắt đầu bằng các từ cho sẵn tom is the best football player in this team => nobody in this team .........................................................................
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