Toán Lớp 11: y=tan3x/2sinx-1 giúp mình với ạ
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Toán Lớp 11: y=tan3x/2sinx-1 giúp mình với ạ
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\left\{ \begin{array}{l}
\cos 3x \ne 0\\
2\sin x – 1 \ne 0
\end{array} \right. \Leftrightarrow \left\{ \begin{array}{l}
3x \ne \dfrac{\pi }{2} + k\pi \\
\sin x \ne \dfrac{1}{2}
\end{array} \right.\\
\Leftrightarrow \left\{ \begin{array}{l}
x \ne \dfrac{\pi }{6} + \dfrac{{k\pi }}{3}\\
x \ne \dfrac{\pi }{6} + k2\pi \\
x \ne \dfrac{{5\pi }}{6} + k2\pi
\end{array} \right. \Rightarrow x \ne \dfrac{\pi }{6} + \dfrac{{k\pi }}{3}\\
D = \mathbb R\backslash \left\{ {\dfrac{\pi }{6} + \dfrac{{k\pi }}{3};k \in \mathbb Z} \right\}
\end{array}$