A. y= sin \(\sqrt x \)
B. y = \(\frac{1}{{2 - {\rm{ cos}}x}}\)
C. y= tan2 x
D. y = \(\frac{{1 - {\mathop{\rm s}\nolimits} {\rm{in}}x}}{{1 + {\rm{ sin}}x}}\)
A. \(0 \le a \le 2;{\rm{ a}} \ne {\rm{1}}\)
B.
\(\left[ \begin{array}{l}
a \le 0\\
a \ge 2
\end{array} \right.\)
C. \(a \ge 2\)
D. \(a \le 0\)
A. 2021
B. 2020
C. 4038
D. 4040
A. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{3} + k2\pi }\\ {x = \frac{{2\pi }}{3} + k2\pi } \end{array}} \right.,\left( {k \in Z} \right)\)
B.
\(\left[ \begin{array}{l}
{\rm{ x = k2}}\pi \\
{\rm{x = }}\frac{{2\pi }}{3} + {\rm{k2}}\pi
\end{array} \right.,\left( {{\rm{k}} \in Z} \right)\)
C. \(\left[ {\begin{array}{*{20}{l}} {{\rm{x = k}}\pi }\\ {{\rm{x = }}\frac{{2\pi }}{3} + {\rm{k}}\pi } \end{array}} \right.,\left( {{\rm{k}} \in Z} \right)\)
D.
\(\left[ \begin{array}{l}
{\rm{ x = }}\frac{\pi }{6}{\rm{ + k2}}\pi \\
{\rm{x = }}\frac{{5\pi }}{6} + {\rm{k2}}\pi
\end{array} \right.,\left( {{\rm{k}} \in Z} \right)\)
A. \(\frac{\pi }{4}\)
B. \(\frac{{7\pi }}{4}\)
C. \(\frac{{3\pi }}{4}\)
D. \(-\frac{\pi }{4}\)
A.
\(\left[ \begin{array}{l}
x = {\rm{ k}}\pi \\
x{\rm{ = }}\frac{\pi }{6} + {\rm{k2}}\pi
\end{array} \right.,{\rm{ }}({\rm{k}} \in Z)\)
B.
\(\left[ \begin{array}{l}
x = {\rm{ k}}\pi \\
x{\rm{ = }} \pm \frac{\pi }{3} + {\rm{k2}}\pi
\end{array} \right.,{\rm{ }}({\rm{k}} \in Z)\)
C.
\(\left[ \begin{array}{l}
x = {\rm{ k}}\pi \\
x{\rm{ = }} \pm \frac{\pi }{6} + {\rm{k2}}\pi
\end{array} \right.,{\rm{ }}({\rm{k}} \in Z)\)
D.
\(\left[ \begin{array}{l}
x = {\rm{ k2}}\pi \\
x{\rm{ = }} \pm \frac{\pi }{6} + {\rm{k2}}\pi
\end{array} \right.,{\rm{ }}({\rm{k}} \in Z)\)
A. y = tan \(\left( {\frac{x}{2}} \right)\)
B. y = sin2x
C. y = cos \(\left( {\frac{x}{2}} \right)\)
D. y = cot2x
A. \(x{\rm{ = }}\frac{{{\rm{ k}}\pi }}{2},{\rm{ }}\left( {{\rm{k}} \in Z} \right)\)
B. \(x{\rm{ = k}}\pi ,{\rm{ }}\left( {{\rm{k}} \in Z} \right)\)
C. \(x{\rm{ = }}\frac{{{\rm{ k}}\pi }}{8},{\rm{ }}\left( {{\rm{k}} \in Z} \right)\)
D. \(x{\rm{ = }}\frac{{{\rm{ k}}\pi }}{4},{\rm{ }}\left( {{\rm{k}} \in Z} \right)\)
A. 0
B. 2
C. 3
D. 1
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