- Phương trình bậc nhất, bậc hai đối với 1 hàm số...

A \(\left[ \begin{array}{l}x = \frac{\pi }{4} + k2\pi \\x = \frac{{3\pi }}{4} + k2\pi \end{array} \right.,k \in \mathbb{Z}.\)

B \(\left[ \begin{array}{l}x = \frac{{3\pi }}{4} + k2\pi \\x = \frac{{ - 3\pi }}{4} + k2\pi \end{array} \right.,k \in \mathbb{Z}.\)

C \(\left[ \begin{array}{l}x = \frac{{5\pi }}{4} + k2\pi \\x = \frac{{ - 5\pi }}{4} + k2\pi \end{array} \right.,k \in \mathbb{Z}.\)

D \(\left[ \begin{array}{l}{\rm{x}} = \frac{\pi }{4} + k2\pi \\x = \frac{{ - \pi }}{4} + k2\pi \end{array} \right.,k \in \mathbb{Z}.\)

A \(\left\{ {\frac{{ - \pi }}{{12}} + k\pi ;k \in \mathbb{Z}} \right\}\)

B \(\left\{ {\frac{{ - \pi }}{{12}} + k2\pi ;k \in \mathbb{Z}} \right\}\)

C \(\left\{ {\frac{{ - \pi }}{2} + k\pi ;k \in \mathbb{Z}} \right\}\)

D \(\left\{ {\frac{{ - \pi }}{{12}} + \frac{{k\pi }}{2};k \in \mathbb{Z}} \right\}\)

A \(\left[ \begin{array}{l}x = k2\pi \\x =  \pm \frac{\pi }{3} + m2\pi \end{array} \right.\,\,,k,\;m \in \mathbb{Z}\)    

B \(\left[ \begin{array}{l}x = k\pi \\x =  \pm \frac{\pi }{3} + m2\pi \end{array} \right.,k,\;m \in \mathbb{Z}\)

C \(\left[ \begin{array}{l}x = k2\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)  

D \(\left[ \begin{array}{l}x = k\pi \\x = \frac{\pi }{3} + m2\pi \end{array} \right.\,,k,\;m \in \mathbb{Z}\)

A \(x = \frac{\pi }{2} + k2\pi ,k \in \mathbb{Z}.\)

B \({\rm{x}} = 0\)

C \({\rm{x}} = \frac{\pi }{2} + k\pi ,k \in \mathbb{Z}.\)

D \({\rm{x}} = k\pi ,k \in \mathbb{Z}.\)

A \(\frac{\pi }{4} - \frac{1}{2}\)

B \(\frac{\pi }{{12}} - \frac{1}{2}\)

C \(\frac{{5\pi }}{{12}} - \frac{1}{2}\)

D \(\frac{\pi }{2} - \frac{1}{2}\)

A \(x = \frac{\pi }{3}\)

B \(x = \frac{\pi }{2}\)

C \(x = \frac{\pi }{6}\)

D \(x = \frac{{5\pi }}{6}\)

A \(\left[ \begin{array}{l}x = \pi  + k2\pi \\x = \frac{{2\pi }}{3} + m2\pi \\x = \frac{{ - 2\pi }}{3} + n2\pi \end{array} \right.,k,\;m,\;n \in \mathbb{Z}.\)

B \(\left[ \begin{array}{l}x = \pi  + k2\pi \\x = \frac{\pi }{3} + m4\pi \\x = \frac{{ - \pi }}{3} + n4\pi \end{array} \right.,k,\;m,\;n \in \mathbb{Z}.\)        

C \(\left[ \begin{array}{l}x = \pi  + k4\pi \\x = \frac{{2\pi }}{3} + m4\pi \\x = \frac{{ - 2\pi }}{3} + n4\pi \end{array} \right.,k,\;m,\;n \in \mathbb{Z}.\)

D \(\left[ \begin{array}{l}x = \pi  + k2\pi \\x = \frac{{4\pi }}{3} + m4\pi \\x =  - \frac{{4\pi }}{3} + n4\pi \end{array} \right.,k,\;m,\;n \in \mathbb{Z}.\)

A \(\left[ \begin{array}{l}x = k\pi \\x =  \pm \frac{\pi }{6} + k2\pi \end{array} \right.\)

B \(\left[ \begin{array}{l}x = k\pi \\x =  \pm \frac{\pi }{6} + k\pi \end{array} \right.\)

C \(\left[ \begin{array}{l}x = k2\pi \\x =  \pm \frac{\pi }{3} + k2\pi \end{array} \right.\)

D \(x =  \pm \frac{\pi }{6} + k2\pi \)

A \(x = \frac{\pi }{6}\)

B \(x = \frac{\pi }{2}\)

C \(x = \frac{{3\pi }}{2}\)

D \(x = \frac{{5\pi }}{6}\)

A 0

B 2

C 3

D 1

A 16

B 17

C 15

D 18

A 3

B 2

C 1

D 0

A \(\left[ \begin{array}{l}m \ge 3\\m <  - 1\end{array} \right.\)

B \(\left[ \begin{array}{l}m > 3\\m <  - 1\end{array} \right.\)   

C \(m \ge 3\)

D \(\left[ \begin{array}{l}m > 3\\m \le  - 1\end{array} \right.\)

A \(\frac{{605\pi }}{3}\)

B \(200\pi \)

C \(\frac{{610\pi }}{3}\)

D \(205\pi \)

A 6

B 8

C 9

D 7

A 95

B 96

C 97

D 98

A 3

B 4

C 5

D 2

A \(8\pi \)

B \(10\pi \)

C \(9\pi \)

D \(12\pi \)

A \(\frac{1}{2} < m < 1\)

B \( - \frac{1}{2} < m \le \frac{1}{2}\)

C \(\left[ \begin{array}{l}m <  - \frac{1}{2}\\m > \frac{1}{2}\end{array} \right.\)

D \(\frac{1}{3} \le m \le 1\)

A \(\frac{1}{3} < m < 1\)

B \(m <  - 1\)

C \(\left[ \begin{array}{l}m < \frac{1}{3}\\m > 1\end{array} \right.\)

D \(\frac{1}{3} < m \le 1\)