Tập xác định của hàm số \(y = \dfrac{{\cos x - 3}}{{\sin x - \cos x}}\) là:
A.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(\mathbb{R}\backslash \left\{ { - \dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(\mathbb{R}\backslash \left\{ { - \dfrac{\pi }{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
A.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
B.\(\mathbb{R}\backslash \left\{ { - \dfrac{\pi }{4} + k\pi ,\,\,k \in \mathbb{Z}} \right\}\)
C.\(\mathbb{R}\backslash \left\{ { - \dfrac{\pi }{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
D.\(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)
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Hóa Học lớp 12
