- Phương trình lượng giác cơ bản (chứa tan, cot) (...

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

B \({\rm{x}} = \frac{\pi }{6} + k2\pi \)

C \({\rm{x}} = \frac{\pi }{6} + k\pi \)

D \({\rm{x}} =  - \frac{\pi }{3} + k\pi \)

A \({\rm{x}} =  - \frac{\pi }{3} + k\pi \)

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

C vô nghiệm

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

A \(x = {45^o} + k \cdot {180^o}\)

B \(x = {5^o} + k \cdot {60^o}\)

C \(x = {25^o} + k \cdot {60^o}\)

D \(x = {15^o} + k \cdot {180^o}\)  

A \(\left\{ {\frac{\pi }{4}{\rm{;}}\frac{{5\pi }}{4}} \right\}\)

B \(\left\{ {\frac{\pi }{3}{\rm{;}}\frac{{4\pi }}{3}} \right\}\)

C \(\left\{ {{\pi  \over 6};{{5\pi } \over 6}} \right\}\)

D \(\left\{ {\frac{\pi }{6}{\rm{;}}\frac{{7\pi }}{6}} \right\}\)

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

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

C Vô nghiệm      

D \(x = \frac{\pi }{2} + \frac{1}{2}k\pi ;k \in \mathbb{Z}\)

A \(x =  - {10^o} + k{.360^o};k \in \mathbb{Z}\)    

B \(x =  - {20^o} + k{.360^o};k \in \mathbb{Z}\)

C \(x =  - {10^o} + k{.90^o};k \in \mathbb{Z}\)      

D \(x =  - {10^o} + k{.180^o};k \in \mathbb{Z}\)

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

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

C \(x = \frac{\pi }{3} + k2\pi ;k \in \mathbb{Z}.\)

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

A \(x = k\pi ;k \in \mathbb{Z}.\)

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

C Vô nghiệm      

D \(x = k2\pi ;k \in \mathbb{Z}.\)

A 9

B 10

C 11

D 12

A \(21\pi \)

B \(25\pi \)

C \(15\pi \)

D \(18\pi \)

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

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

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

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

A \(5\pi \)

B \(\frac{{17\pi }}{3}\)      

C \(6\pi \)

D \(\frac{{19\pi }}{3}\)

A 1284

B 1283

C 1014

D 2018

A -65

B -63

C -64

D -66

A \(\frac{1}{3}\, < \,m\, < \frac{1}{2}\)

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

C \(\left[ \begin{array}{l}m\, > \,0\\m\, < \, - 1\end{array} \right.\)

D \( - 1\, < \,m\, < \,\frac{1}{4}\)