Tìm tập xác định của hàm số \(y = \dfrac{{\cot \left( {2x} \right)}}{{\cos \left( {2x} \right)}}\).
A.\(D = \mathbb{R}\backslash \left\{ {\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
B.\(D = \mathbb{R}\backslash \left\{ -{\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
C.\(D = \mathbb{R}\backslash \left\{ {\dfrac{{k\pi }}{2};\,\,k \in \mathbb{Z}} \right\}\).
D.\(D = \mathbb{R}\backslash \left\{ \pm {\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
A.\(D = \mathbb{R}\backslash \left\{ {\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
B.\(D = \mathbb{R}\backslash \left\{ -{\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
C.\(D = \mathbb{R}\backslash \left\{ {\dfrac{{k\pi }}{2};\,\,k \in \mathbb{Z}} \right\}\).
D.\(D = \mathbb{R}\backslash \left\{ \pm {\dfrac{{k\pi }}{4};\,\,k \in \mathbb{Z}} \right\}\).
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Hóa Học lớp 12
