20 bài tập trắc nghiệm phương trình lượng giác cơ...

A \(x = \dfrac{{k\pi }}{6},\,\,x = \dfrac{{k\pi }}{{10}}\).

B \(x = \dfrac{{k\pi }}{6},\,\,x = \dfrac{{k\pi }}{{20}}\).

C \(x = \dfrac{{k\pi }}{3},\,\,x = \dfrac{{k\pi }}{{20}}\).

D \(x = \dfrac{{k\pi }}{3},\,\,x = \dfrac{{k\pi }}{{10}}\).

A 1

B 2

C 3

D 4

A \(x =  - {30^0}\)

B \(x =  - {60^0}\)

C \(x = {30^0}\)

D \(x =  - {60^0},\,\,x = {30^0}\)

A 980

B 51

C 981

D 1000

A \(3\)

B \(2\)

C \(1\)

D \(4\)

A \(x = \dfrac{{5\pi }}{6} + k2\pi \)

B \(x = \dfrac{\pi }{6}\)

C \(x = \dfrac{\pi }{3} + k2\pi \)

D \(x = \dfrac{\pi }{3}\)

A \(x = \dfrac{\pi }{6} + k2\pi \)

B Vô nghiệm

C \(x =  - \dfrac{\pi }{6} + k2\pi \)

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

A \(\left[ \begin{array}{l}m = 1\\m = \dfrac{1}{2}\end{array} \right.\)

B \(\left[ \begin{array}{l}m =  - \dfrac{3}{2}\\m = 0\end{array} \right.\)

C \(\left[ \begin{array}{l}m =  - \dfrac{1}{4}\\m = \dfrac{2}{3}\end{array} \right.\)

D \(\left[ \begin{array}{l}m =  - \dfrac{1}{2}\\m = \dfrac{1}{3}\end{array} \right.\)

A 1

B 3

C 2

D 0

A \(S = \left\{ {x = \left. {\frac{\pi }{6} + k2\pi ;\,\,x =  - \frac{\pi }{6} + k2\pi } \right|k \in Z} \right\}\).                 

B \(S = \left\{ {x = \left. {\frac{\pi }{3} + k2\pi ;\,\,x =  - \frac{\pi }{3} + k2\pi } \right|k \in Z} \right\}\).

C \(S = \left\{ {x = \left. {\frac{\pi }{3} + k2\pi ;\,\,x =  - \frac{\pi }{3} + k\pi } \right|k \in Z} \right\}\).                               

D  \(S = \left\{ {x = \left. {\frac{\pi }{3} + k2\pi ;\,\,x =  - \frac{{5\pi }}{6} + k2\pi } \right|k \in Z} \right\}\).

A \(\frac{{169\pi }}{4}\)

B \(\frac{{165\pi }}{4}\)

C \(\frac{{171\pi }}{4}\)

D \(40\pi \)

A 4

B 6

C 8

D 10

A 80

B 82

C 159

D 160

A \(\frac{{225\pi }}{{36}}\)

B \(\frac{{226\pi }}{{36}}\)

C \(\frac{{228\pi }}{{36}}\)            

D \(\frac{{227\pi }}{{36}}\)

A \(\dfrac{1}{3} < m < \dfrac{1}{2}\)

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

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

D \( - 1 < m < \dfrac{1}{4}\)

A \(m \in \left( {0;1} \right] \cup \left[ {\dfrac{3}{2}; + \infty } \right)\)

B \(m \in \left( { - \infty ;1} \right] \cup \left[ {\dfrac{3}{2}; + \infty } \right)\)

C \(m \in \left( {0;{1 \over 2}} \right] \cup \left[ {1;{3 \over 2}} \right)\)

D \(m \in \left[ {0;1} \right) \cup \left[ {\dfrac{3}{2};2} \right)\)

A \(x = \dfrac{\pi }{6} + k\dfrac{\pi }{3}\)  

B \( - \dfrac{\pi }{6} + k\dfrac{\pi }{3}\)

C \(\dfrac{\pi }{2} + k\pi \)

D \(\dfrac{\pi }{6} + k\pi \) 

A \(x = \dfrac{\pi }{2}\)

B \(x = 0\)

C \(x = \pi \)

D \(x =  - \dfrac{\pi }{2}\)

A \(4\)

B \(1\)

C \(3\)

D \(2\)

A 10

B 9

C 8

D 12