Toán Lớp 11: y=tan2x – cot2x tìm tập xác định
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Toán Lớp 11: y=tan2x – cot2x tìm tập xác định
Comments ( 2 )
\left\{ \begin{array}{l}
\sin 2x \ne 0\\
\cos 2x \ne 0
\end{array} \right. \Rightarrow \sin 4x \ne 0\\
\Leftrightarrow 4x \ne k\pi \\
\Leftrightarrow x \ne \dfrac{{k\pi }}{4}\left( {k \in \mathbb{Z}} \right)\\
\Rightarrow D = \mathbb{R}\backslash \left\{ {\dfrac{{k\pi }}{4}|k \in \mathbb{Z}} \right\}
\end{array}$