Tìm tập xác định của hàm số sau \(y = \dfrac{{ \cot x}}{{2 \sin x - 1}} \)
A.\(D = \backslash \left\{ {k\pi ;\frac{\pi }{6} + k2\pi ; - \frac{\pi }{6} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
B.\(D = \backslash \left\{ {\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi {\rm{ }}\left( {k \in Z } \right)} \right\}\)
C.\(D = \backslash \left\{ {k\pi ;\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
D.\(D = \backslash \left\{ {k\pi ;\dfrac{\pi }{3} + k2\pi ;\dfrac{{2\pi }}{3} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
A.\(D = \backslash \left\{ {k\pi ;\frac{\pi }{6} + k2\pi ; - \frac{\pi }{6} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
B.\(D = \backslash \left\{ {\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi {\rm{ }}\left( {k \in Z } \right)} \right\}\)
C.\(D = \backslash \left\{ {k\pi ;\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
D.\(D = \backslash \left\{ {k\pi ;\dfrac{\pi }{3} + k2\pi ;\dfrac{{2\pi }}{3} + k2\pi {\rm{ }}\left( {k \in Z} \right)} \right\}\)
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Hóa Học lớp 12
