Câu 21 (TH): t}\nolimits} {\rm{anx}}}}{{1 - c{\rm{o}}{{\rm{s}}^2}x}}\)
A.\(R\backslash \left\{ {\frac{\pi }{2} + k2\pi ,k \in Z} \right\}\)
B.\(R\backslash \left\{ {\frac{{k\pi }}{2},k \in Z} \right\}\)
C.\(R\backslash \left\{ {\frac{{ - \pi }}{2} + k2\pi ,k \in Z} \right\}\)
D.\(R\backslash \left\{ {k\pi ,k \in Z} \right\}\)
A.\(R\backslash \left\{ {\frac{\pi }{2} + k2\pi ,k \in Z} \right\}\)
B.\(R\backslash \left\{ {\frac{{k\pi }}{2},k \in Z} \right\}\)
C.\(R\backslash \left\{ {\frac{{ - \pi }}{2} + k2\pi ,k \in Z} \right\}\)
D.\(R\backslash \left\{ {k\pi ,k \in Z} \right\}\)
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Hóa Học lớp 12
