Tập xác định của hàm số \(y = \dfrac{1}{{\sqrt {1 - \cos x} }}\) là:
A.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k2\pi ;\,\,k \in \mathbb{Z}} \right\}\)
B.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k\pi ;k \in \mathbb{Z}} \right\}\)
C.\(\mathbb{R}\backslash \left\{ {k2\pi ;\,\,k \in \mathbb{Z}} \right\}\)
D.\(\mathbb{R}\backslash \left\{ {k\pi ;\,\,k \in \mathbb{Z}} \right\}\)
A.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k2\pi ;\,\,k \in \mathbb{Z}} \right\}\)
B.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k\pi ;k \in \mathbb{Z}} \right\}\)
C.\(\mathbb{R}\backslash \left\{ {k2\pi ;\,\,k \in \mathbb{Z}} \right\}\)
D.\(\mathbb{R}\backslash \left\{ {k\pi ;\,\,k \in \mathbb{Z}} \right\}\)
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Hóa Học lớp 12
