Trắc nghiệm Phương trình lượng giác cơ bản Toán Lớp 11

A. \(\left[\begin{array}{l} x=\frac{3 \pi}{4}+k_{1} \pi \\ x=k_{2} \pi \\ x=\frac{\pi}{2}+k_{3} 2 \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{3 \pi}{4}+k_{1} \pi \\ x=\frac{\pi}{2}+k_{3} 2 \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\frac{3 \pi}{4}+k_{1} \pi \\ x=k_{2} 2 \pi \end{array}\right.\)

D. \(\left[\begin{array}{l} x=\frac{3 \pi}{4}+k_{1} \pi \\ x=k_{2} 2 \pi \\ x=\frac{\pi}{2}+k_{3} 2 \pi \end{array}\right.\)

A. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{3} + {k_1}\frac{\pi }{2}}\\ {x = \frac{\pi }{{12}} + {k_2}\pi }\\ {x = \frac{{5\pi }}{{6}} + {k_3}\pi .} \end{array}} \right.\)

B. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{3} + {k_1}\frac{\pi }{2}}\\ {x = \frac{\pi }{{6}} + {k_2}\pi }\\ {x = \frac{{5\pi }}{{12}} + {k_3}\pi .} \end{array}} \right.\)

C. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{4} + {k_1}\frac{\pi }{2}}\\ {x = \frac{\pi }{{12}} + {k_2}\pi }\\ {x = \frac{{5\pi }}{{12}} + {k_3}\pi .} \end{array}} \right.\)

D. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{4} + {k_1}\frac{\pi }{2}}\\ {x = \frac{\pi }{{6}} + {k_2}\pi }\\ {x = \frac{{5\pi }}{{12}} + {k_3}\pi .} \end{array}} \right.\)

A. Vô nghiệm.

B. \(\left[\begin{array}{l} x=\pm \frac{\pi}{3}+k_{1} 2 \pi \\ x=\pi+k_{2} 2 \pi \\ x=-\frac{3\pi}{2}+k_{3} 2 \pi . \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\pm \frac{\pi}{3}+k_{1} 2 \pi \\ x=\pi+k_{2} 2 \pi \\ x=-\frac{\pi}{2}+k_{3} 2 \pi . \end{array}\right.\)

D. \(\left[\begin{array}{l} x=\pm \frac{\pi}{3}+k_{1} 2 \pi \\ x=\pi+k_{2} 2 \pi \end{array}\right.\)

A. \( x= \frac{\pi}{3}+k 2 \pi, k \in \mathbb{Z}\)

B. \( x=\pm \frac{\pi}{3}+k 2 \pi, k \in \mathbb{Z}\)

C. \( x=\pm \frac{2\pi}{3}+k 2 \pi, k \in \mathbb{Z}\)

D. Vô nghiệm.

A. \(x=\frac{\pi}{4}+k^{\prime} \pi \)

B. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{\pi}{4}+k^{\prime} \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{3\pi}{4}+k^{\prime} \pi \end{array}\right.\)

D. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{\pi}{3}+k^{\prime} \pi \end{array}\right.\)

A. \(\left[ {\begin{array}{*{20}{l}} {x = \frac{\pi }{3} {k_1}\pi }\\ {x = - \frac{\pi }{2} + {k_2}2\pi .} \end{array}} \right.\)

B. \(\left[ {\begin{array}{*{20}{l}} {x = {k_1}\pi }\\ {x = \frac{\pi }{2} + {k_2}2\pi .} \end{array}} \right.\)

C. Vô nghiệm.

D. \(\left[ {\begin{array}{*{20}{l}} {x = {k_1}\pi }\\ {x = - \frac{\pi }{2} + {k_2}2\pi .} \end{array}} \right.\)

A. \(\left[\begin{array}{l} x=k_{1} \pi \\ x=\frac{\pi}{3}+k_{2} 2 \pi \end{array}\right.\)

B. Vô nghiệm.

C. \(\left[\begin{array}{l} x=k_{1} \pi \\ x=\frac{\pi}{2}+k_{2} 2 \pi \end{array}\right.\)

D. \(\left[\begin{array}{l} x=k_{1} 2\pi \\ x=\frac{\pi}{2}+k_{2} 2 \pi \end{array}\right.\)

A. \(x=\frac{\pi}{2}\)

B. \(x=\frac{\pi}{3}\)

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

D. x=0.

A. \( x=k 2\pi .\)

B. \( x=\frac{\pi}{2}+k \pi .\)

C. Vô nghiệm.

D. \( x=k \pi .\)

A. \(x = \frac{\pi }{2}\)

B. \(\left[ \begin{array}{l} x = \frac{\pi }{2}\\ x = 0 \end{array} \right.\)

C. \(\left[ \begin{array}{l} x = \frac{\pi }{3}\\ x = 0 \end{array} \right.\)

D. \(\left[ \begin{array}{l} x = \frac{3\pi }{2}\\ x = 0 \end{array} \right.\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{3}+k 2 \pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k 2 \pi \\ x=k^{\prime} \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k 2 \pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

D. Vô nghiệm.

A. \(x = \frac{\pi }{2}\)

B. \(x = \frac{2\pi }{3}\)

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

D. \(x = \frac{\pi }{3}\)

A. \({\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x= \frac{\pi}{3}+k^{\prime} 2 \pi \end{array}\right.}\)

B. \({\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=\pm \frac{\pi}{3}+k^{\prime} 2 \pi \end{array}\right.}\)

C. \({\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=\pm \frac{2\pi}{3}+k^{\prime} 2 \pi \end{array}\right.}\)

D. \({\left[\begin{array}{l} x=-\frac{3\pi}{2}+k 2 \pi \\ x=\pm \frac{\pi}{3}+k^{\prime} 2 \pi \end{array}\right.}\)

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

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

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

D. \(x = \frac{3\pi }{2}\)

A. \( x = \frac{2\pi }{3}\)

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

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

D. \( x =- \frac{\pi }{3}\)

A. Vô nghiệm.

B. \(x=\pm \frac{3\pi}{2}+k 2 \pi\)

C. \(x=\pm \frac{\pi}{3}+k 2 \pi\)

D. \(x=\frac{2\pi}{3}+k 2 \pi\)

A. \( x=\pm \frac{3 \pi}{4}+k 2 \pi .\)

B. \( x= \frac{3 \pi}{4}+k 2 \pi .\)

C. \( x= \frac{ \pi}{4}+k 2 \pi .\)

D. \( x=\pm \frac{5 \pi}{4}+k 2 \pi .\)

A. \(\left[\begin{array}{l} x=\frac{3\pi}{2}+k_{1} 2 \pi \\ x=\pm \frac{\pi}{6}+k_{2} 2 \pi . \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k_{1} 2 \pi \\ x=\frac{\pi}{6}+k_{2} 2 \pi . \end{array}\right.\)

C. Vô nghiệm.

D. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k_{1} 2 \pi \\ x=\pm \frac{\pi}{6}+k_{2} 2 \pi . \end{array}\right.\)

A. \( x=\pm \frac{\pi}{3}+k 2 \pi\)

B. \( x= \frac{\pi}{3}+k 2 \pi\)

C. \( x=\pm \frac{2\pi}{3}+k 2 \pi\)

D. \( x= \frac{\pi}{4}+k 2 \pi\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{3}+k_{1} \pi \\ x=\frac{\pi}{2}+k_{2} 2 \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{3}+k_{1} \pi \\ x=\frac{\pi}{2}+k_{2} 2 \pi \\ x=-\frac{\pi}{6}+k_{3} 2 \pi \end{array}\right.\)

C. Vô nghiệm.

D. \(\left[\begin{array}{l} x=\frac{\pi}{3}+k_{1} \pi \\ x=\frac{\pi}{2}+k_{2} 2 \pi \\ x=-\frac{5\pi}{6}+k_{3} 2 \pi \end{array}\right.\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k 2\pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\frac{\pi}{3}+k \pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

D. \(\left[\begin{array}{l} x=\frac{\pi}{4}+k 2\pi \\ x=k^{\prime} 2 \pi \end{array}\right.\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\frac{\pi}{2}+k_{3} \frac{\pi}{2} \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\frac{3\pi}{4}+k_{3} \frac{\pi}{2} \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\frac{\pi}{4}+k_{3} \frac{\pi}{2} \end{array}\right.\)

D. Vô nghiệm.

A. Vô nghiệm.

B. \({\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=k_{3} \pi \\ x= \frac{\pi}{3}+k_{4} \pi \end{array}\right.}\)

C. \({\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\pm \frac{\pi}{3}+k_{4} \pi \end{array}\right.}\)

D. \({\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=k_{3} \pi \\ x=\pm \frac{\pi}{3}+k_{4} \pi \end{array}\right.}\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\frac{\pi}{2}+k_{3} \pi . \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=\frac{\pi}{6}+k_{1} 2 \pi \\ x=\frac{5 \pi}{6}+k_{2} 2 \pi \\ x=\pm \frac{\pi}{2}+k_{3} \pi . \end{array}\right.\)

D. Vô nghiệm.

A. \(\left[\begin{array}{l} x=\pm \frac{2 \pi}{3}+k_{1} 2 \pi \\ x=\frac{\pi}{12}+k_{2} \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=\pm \frac{2 \pi}{3}+k_{1} 2 \pi \\ x=\frac{\pi}{8}+k_{2} \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x= \frac{2 \pi}{3}+k_{1} 2 \pi \\ x=\frac{\pi}{4}+k_{2} \pi \end{array}\right.\)

D. \(\left[\begin{array}{l} x=\pm \frac{2 \pi}{3}+k_{1} 2 \pi \\ x=\frac{\pi}{4}+k_{2} \pi \end{array}\right.\)

A. \(x=\frac{\pi}{3}+k 2 \pi\)

B. \(x=\frac{\pi}{2}+k 2 \pi\)

C. \(x=\pi+k 2 \pi\)

D. Vô nghiệm.

A. \(\left[ {\begin{array}{*{20}{l}} {x = {k_1}\pi }\\ {x = - \frac{\pi }{6} + {k_2}2\pi }\\ {x = \frac{{7\pi }}{6} + {k_3}2\pi } \end{array}} \right.\)

B. \(\left[ {\begin{array}{*{20}{l}} {x = {k_1}\pi }&{}\\ {x = - \frac{\pi }{6} + {k_2}2\pi }&{}\\ {x = \frac{{7\pi }}{6} + {k_3}2\pi }&{}\\ {x = \pm \frac{\pi }{3} + {k_4}2\pi .}&{} \end{array}} \right.\)

C. \(\left[ {\begin{array}{*{20}{l}} {x = {k_1}\pi }&{}\\ {x = - \frac{5\pi }{6} + {k_2}2\pi }&{}\\ {x = \frac{{7\pi }}{6} + {k_3}2\pi }&{}\\ {x = \pm \frac{\pi }{3} + {k_4}2\pi .}&{} \end{array}} \right.\)

D. Vô nghiệm.

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

B. \(\left[\begin{array}{l} x=k \pi \\ x=\frac{2\pi}{3}+n \pi \end{array},(k, n \in \mathbb{Z}) .\right.\)

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

D. Vô nghiệm.

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

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

C. Vô Nghiệm.

D. \(\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=\pm \frac{\pi}{3}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

A. Vô nghiệm.

B. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\pm\frac{\pi}{4}+k \pi \end{array}, k \in \mathbb{Z}\right.\)

C. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{\pi}{4}+k \pi \end{array}, k \in \mathbb{Z}\right.\)

D. \(\left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{\pi}{4}+k 2\pi \end{array}, k \in \mathbb{Z}\right.\)

A. \(x=\pm\frac{\pi}{4}+k \pi, k \in \mathbb{Z}\)

B. \(x=-\frac{\pi}{3}+k \pi, k \in \mathbb{Z}\)

C. Vô nghiệm.

D. \(x=-\frac{\pi}{4}+k \pi, k \in \mathbb{Z}\)

A. \(\left[\begin{array}{c} x=\frac{\pi}{4}+k \pi \\ x=-\frac{\pi}{4}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

B. \(\left[\begin{array}{c} x=\frac{\pi}{4}+k \pi \\ x=-\frac{3\pi}{4}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. \(\left[\begin{array}{c} x=\frac{\pi}{3}+k \pi \\ x=-\frac{\pi}{4}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

D. Vô nghiệm.

A. \(\left[\begin{array}{c} x=-\frac{3\pi}{4}+k \pi \\ x=k \pi \quad\\ x=\frac{3 \pi}{2}+k 2 \pi \end{array}\right.,k \in \mathbb{Z} \)

B. \(\left[\begin{array}{c} x=-\frac{\pi}{4}+k \pi \\ x=k \pi \quad\\ x=\frac{3 \pi}{2}+k 2 \pi \end{array}\right.,k \in \mathbb{Z} \)

C. \(\left[\begin{array}{c} x=-\frac{\pi}{4}+k \pi \\ x=k 2 \pi \quad, k \in \mathbb{Z} \\ x=\frac{3 \pi}{2}+k 2 \pi \end{array}\right.\)

D. \(\left[\begin{array}{c} x=-\frac{\pi}{4}+k \pi \\ x=k 2 \pi \quad, k \in \mathbb{Z} \end{array}\right.\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=\frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

B. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=-\frac{\pi}{6}+k 2 \pi \\ x=\frac{5 \pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. Vô nghiệm.

D. \(\left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=\frac{\pi}{6}+k 2 \pi \\ x=\frac{5 \pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

A. \(\left[\begin{array}{c} x=k \pi \\ x=\pm \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

B. \(\left[\begin{array}{c} x=k2 \pi \\ x=\pm \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. \(\left[\begin{array}{c} x=k \pi \\ x= \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

D. \(\left[\begin{array}{c} x=k \pi \\ x=\pm \frac{\pi}{3}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

A. \(\left[\begin{array}{c} x=\frac{\pi}{3}+k 2 \pi \\ x=\frac{2 \pi}{3}+k 2 \pi \\ x=k \pi \end{array}, k \in \mathbb{Z}\right.\)

B. \(\left[\begin{array}{c} x=\frac{\pi}{3}+k 2 \pi \\ x=\frac{2 \pi}{3}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. \(\left[\begin{array}{c} x=\frac{\pi}{3}+k 2 \pi \\ x=\frac{4 \pi}{3}+k 2 \pi \\ x=k \pi \end{array}, k \in \mathbb{Z}\right.\)

D. \(\left[\begin{array}{c} x=\frac{4\pi}{3}+k 2 \pi \\ x=\frac{2 \pi}{3}+k 2 \pi \\ x=k \pi \end{array}, k \in \mathbb{Z}\right.\)

A. \(\left[\begin{array}{c} x=k 2 \pi \\ x=\frac{3 \pi}{2}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

B. \(\left[\begin{array}{c} x=k 2 \pi \\ x=\frac{3 \pi}{2}+k 2 \pi \\ x=\frac{-\pi}{2}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. Vô nghiệm.

D. \(\left[\begin{array}{c} x=k 2 \pi \\ x=\frac{3 \pi}{2}+k 2 \pi \\ x=\frac{\pi}{2}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

A. \( \left[\begin{array}{l} x=\pm\pi+k 2 \pi \\ x=\frac{3 \pi}{4}+k \pi \end{array}\right.\)

B. \( \left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{3 \pi}{4}+k \pi \end{array}\right.\)

C. \( \left[\begin{array}{l} x=\pi+k 2 \pi \\ x=\frac{ \pi}{4}+k \pi \end{array}\right.\)

D. \(x=\pi+k 2 \pi \)

A. Vô nghiệm.

B. \( \left[\begin{array}{l} x=\frac{\pi}{3}+k 2 \pi \\ x=\pm \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

C. \( \left[\begin{array}{l} x=\frac{\pi}{2}+k 2 \pi \\ x=\pm \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

D. \( \left[\begin{array}{l} x=\frac{3\pi}{2}+k 2 \pi \\ x=\pm \frac{\pi}{6}+k 2 \pi \end{array}, k \in \mathbb{Z}\right.\)

A. \(x=\frac{1}{2} \arccos \frac{-2+\sqrt{2}}{2}+k \pi,(k \in \mathbb{Z}) \)

B. \(x=\pm \frac{1}{2} \arccos \frac{-2+\sqrt{2}}{2}+k \pi,(k \in \mathbb{Z}) \)

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

D. \(x=\pm \arccos \frac{-2+\sqrt{2}}{2}+k \pi,(k \in \mathbb{Z}) \)

A. \( \quad\left[\begin{array}{l} x=\frac{13 \pi}{48}+\frac{k \pi}{4} \\ x=-\frac{29 \pi}{24}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

B. \( \quad\left[\begin{array}{l} x=\frac{13 \pi}{48}+\frac{k \pi}{4} \\ x=-\frac{15 \pi}{24}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

C. Vô nghiệm.

D. \( \quad\left[\begin{array}{l} x=\frac{11 \pi}{48}+\frac{k \pi}{4} \\ x=-\frac{5 \pi}{24}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

A. \(x= \frac{\pi}{4}+k \pi,(k \in \mathbb{Z})\)

B. \(x=\pm \frac{\pi}{4}+k \pi,(k \in \mathbb{Z})\)

C. \(x=\pm \frac{\pi}{6}+k \pi,(k \in \mathbb{Z})\)

D. \(x=\frac{\pi}{6}+k \pi,(k \in \mathbb{Z})\)

A. \(x=\pm \frac{\pi}{3}+k \pi,(k \in \mathbb{Z})\)

B. \(x= \frac{\pi}{12}+k \pi,(k \in \mathbb{Z})\)

C. \(x=\frac{\pi}{3}+k \pi,(k \in \mathbb{Z})\)

D. \(x=\pm \frac{\pi}{12}+k \pi,(k \in \mathbb{Z})\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{24}+\frac{k \pi}{2} \\ x=\frac{5 \pi}{24}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

B. \(x=\frac{\pi}{24}+\frac{k \pi}{2} \)

C. \(\left[\begin{array}{l} x=\frac{\pi}{24}+\frac{k \pi}{2} \\ x=\frac{ \pi}{12}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

D. \(\left[\begin{array}{l} x=-\frac{\pi}{24}+\frac{k \pi}{2} \\ x=-\frac{5 \pi}{24}+\frac{k \pi}{2} \end{array}(k \in \mathbb{Z})\right.\)

A. \( x=\pi+\frac{k \pi}{4},(k \in \mathbb{Z})\)

B. \( x=\frac{\pi}{3}+\frac{k \pi}{4},(k \in \mathbb{Z})\)

C. \( x=\pm\frac{\pi}{4}+\frac{k \pi}{4},(k \in \mathbb{Z})\)

D. \( x=\frac{\pi}{4}+\frac{k \pi}{4},(k \in \mathbb{Z})\)

A. \(\left[\begin{array}{l} x=\frac{\pi}{20}+\frac{k \pi}{10} \\ x=\pm \frac{\pi}{18}+\frac{k \pi}{3} \end{array}(k \in \mathbb{Z})\right.\)

B. \(\left[\begin{array}{l} x=\frac{-\pi}{20}+\frac{k \pi}{10} \\ x=\pm \frac{\pi}{18}+\frac{k \pi}{3} \end{array}(k \in \mathbb{Z})\right.\)

C. Vô nghiệm.

D. \(\left[\begin{array}{l} x=\frac{5\pi}{2}+\frac{k \pi}{10} \\ x=\pm \frac{\pi}{18}+\frac{k \pi}{3} \end{array}(k \in \mathbb{Z})\right.\)

A. \(x=\frac{k 2\pi}{3},(k \in \mathbb{Z}) \)

B. \(x=\frac{k \pi}{3},(k \in \mathbb{Z}) \)

C. \(x=\frac{k 3\pi}{2},(k \in \mathbb{Z}) \)

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

A. \(\left[\begin{array}{l} x=\pm\frac{\pi}{2}+k 2 \pi \\ x=-\frac{\pi}{12}+l \pi(k, l \in \mathbb{Z}) \\ x=\frac{7 \pi}{12}+l \pi \end{array}\right.\)

B. \(\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=-\frac{\pi}{12}+l \pi(k, l \in \mathbb{Z}) \\ x=\frac{ \pi}{12}+l \pi \end{array}\right.\)

C. \(\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=-\frac{\pi}{12}+l \pi(k, l \in \mathbb{Z}) \end{array}\right.\)

D. \(\left[\begin{array}{l} x=-\frac{\pi}{2}+k 2 \pi \\ x=-\frac{\pi}{12}+l \pi(k, l \in \mathbb{Z}) \\ x=\frac{7 \pi}{12}+l \pi \end{array}\right.\)

A. \( \left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=\pm \frac{2 \pi}{3}+k 2 \pi \\ x=\frac{\pi}{6}+k 2 \pi \\ x=\frac{5 \pi}{6}+k 2 \pi \end{array}(k \in \mathbb{Z})\right.\)

B. \( \left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=\pm \frac{2 \pi}{3}+k 2 \pi \end{array}(k \in \mathbb{Z})\right.\)

C. \( \left[\begin{array}{l} x=\frac{\pi}{2}+k \pi x=\frac{\pi}{6}+k 2 \pi \\ x=\frac{5 \pi}{6}+k 2 \pi \end{array}(k \in \mathbb{Z})\right.\)

D. \( \left[\begin{array}{l} x=\frac{\pi}{2}+k \pi \\ x=\frac{2 \pi}{3}+k 2 \pi \\ x=\frac{\pi}{6}+k 2 \pi \\ x=\frac{5 \pi}{6}+k 2 \pi \end{array}(k \in \mathbb{Z})\right.\)

A. \( \left[\begin{array}{rl} x & =\frac{3\pi}{4}+\frac{k \pi}{2} \\ x & =\frac{\pi}{18}+\frac{l 2 \pi}{3}(k, l \in \mathbb{Z}) . \\ x & =\frac{5 \pi}{18}+\frac{l 2 \pi}{3} \end{array}\right.\)

B. \( \left[\begin{array}{rl} x & =\frac{5\pi}{4}+\frac{k \pi}{2} \\ x & =\frac{\pi}{18}+\frac{l 2 \pi}{3}(k, l \in \mathbb{Z}) . \\ x & =\frac{5 \pi}{18}+\frac{l 2 \pi}{3} \end{array}\right.\)

C. \( \left[\begin{array}{rl} x & =\frac{\pi}{4}+\frac{k \pi}{2} \\ x & =\frac{\pi}{18}+\frac{l 2 \pi}{3}(k, l \in \mathbb{Z}) . \end{array}\right.\)

D. \( \left[\begin{array}{rl} x & =\frac{\pi}{4}+\frac{k \pi}{2} \\ x & =\frac{\pi}{18}+\frac{l 2 \pi}{3}(k, l \in \mathbb{Z}) . \\ x & =\frac{5 \pi}{18}+\frac{l 2 \pi}{3} \end{array}\right.\)