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

A \(2 + k\pi \)

B \(k\pi \)

C \(\arctan 2 + k\pi \)

D \(\arctan \dfrac{1}{2} + k\pi \)

A \(\sin x =  - \dfrac{1}{2}\) 

B \(\cot x =  - \dfrac{{\sqrt 3 }}{3}\)  

C \(\tan x = \sqrt 3 \) 

D \(\cos x =  - \dfrac{1}{2}\) 

A \(\dfrac{\pi }{3} + k\pi \)  

B \(\dfrac{\pi }{6} + k\pi \) 

C \(\dfrac{{5\pi }}{6} + k\pi \) 

D \( - \dfrac{\pi }{6} + k2\pi \) 

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

B \( - \dfrac{\pi }{4} + k\pi \)

C \(\dfrac{{3\pi }}{4} + k2\pi \)

D \(\dfrac{\pi }{4} + k\pi \)

A \(x =  - \dfrac{\pi }{6} + k\pi \)

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

C Vô nghiệm

D \(x =  \pm \dfrac{\pi }{3} + k\pi \)

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

B  \(x = \dfrac{\pi }{2} + k2\pi ,k \in Z\).

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

D  \(x = k\pi ,k \in Z\).

A \(x = 3 + {\rm{arc}}\cot 4 + k\pi \)

B \(x = 4 + {\rm{arc}}\cot 3 + k\pi \)

C \(x = 3 + {\rm{arc}}\cot 4 + k2\pi \)

D \(x = 4 + {\rm{arc}}\cot 3 + k2\pi \)

A \(x = \dfrac{\pi }{3} + k3\pi \)

B \(x = \dfrac{\pi }{3} + k4\pi \)

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

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

A \(x = \frac{{k\pi }}{2}\,\,\left( {k \in Z} \right)\)

B \(x = k\pi \,\,\left( {k \in Z} \right)\)

C \(x = k2\pi \,\,\left( {k \in Z} \right)\)

D Kết quả khác

A \(x = \frac{{k\pi }}{2}\,\,\left( {k \in Z} \right)\)

B \(x = k\pi \,\,\left( {k \in Z} \right)\)

C \(x = k2\pi \,\,\left( {k \in Z} \right)\)

D Kết quả khác

A \(1\)

B \(2\)

C \(4\)

D \(3\)

A 0

B 1

C 2

D 4

A \(x =  - \dfrac{\pi }{2} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\)

B \(x =  - \dfrac{\pi }{4} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\)

C \(x = \pi  + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\)

D \(x =  - \dfrac{\pi }{4} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\)

A \(\left[ \begin{array}{l}x = \dfrac{{11\pi }}{6} + k10\pi \\x =  - \dfrac{{29\pi }}{6} + k10\pi \end{array} \right.\,\,\left( {k \in \mathbb{Z}} \right)\)

B \(\left[ \begin{array}{l}x =  - \dfrac{{11\pi }}{6} + k10\pi \\x = \dfrac{{29\pi }}{6} + k10\pi \end{array} \right.\,\,\left( {k \in \mathbb{Z}} \right)\)

C \(\left[ \begin{array}{l}x =  - \dfrac{{11\pi }}{6} + k10\pi \\x =  - \dfrac{{29\pi }}{6} + k10\pi \end{array} \right.\,\,\left( {k \in \mathbb{Z}} \right)\)

D \(\left[ \begin{array}{l}x = \dfrac{{11\pi }}{6} + k10\pi \\x = \dfrac{{29\pi }}{6} + k10\pi \end{array} \right.\,\,\left( {k \in \mathbb{Z}} \right)\)  

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

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

C \(x =  \pm \dfrac{\pi }{3} + k2\pi ,\,\,k \in \mathbb{Z}\)

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

A \(\left\{ {\dfrac{{3\pi }}{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)  

B \(\left\{ { - \dfrac{\pi }{4} + k2\pi ,\,\,\dfrac{{5\pi }}{4} + k2\pi \,\,k \in \mathbb{Z}} \right\}\)

C \(\left\{ { \pm \dfrac{{3\pi }}{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)  

D \(\left\{ { \pm \dfrac{\pi }{4} + k2\pi ,\,\,k \in \mathbb{Z}} \right\}\)

A 8.

B 6.

C 2.

D 4.

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

B \(x =  \pm \alpha  + k2\pi ,\,\,k \in \mathbb{Z}\)

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

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

A \(\sqrt 3 \sin x - 2 = 0\)

B \(2\sin x - \sqrt 3  = 0\)

C \(3\cos x - 2 = 0\)

D \(3\sin x - 2 = 0\)

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

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

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

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